作者： Liu, Hao;Wang, Ya;Dong, Liming;Wang, Haiou;Zhang, Yun;...

期刊： Journal of Materials Science: Materials in Electronics,2021年32(1):745-751 ISSN：0957-4522

通讯作者： Zhang, Zhengzhong;Tan, Weishi

作者机构： [Liu, Hao; Zhang, Zhengzhong] Huaiyin Inst Technol, Fac Appl Technol, Huaian 223003, Peoples R China.;[Wang, Ya] Shanghai Urban Construct Vocat Coll, Shanghai 201415, Peoples R China.;[Dong, Liming] Changshu Inst Technol, Sch Automat Engn, Changshu 215500, Jiangsu, Peoples R China.;[Wang, Haiou] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;[Zhang, Yun] Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Peoples R China.

通讯机构： [Zhang, Zhengzhong; Tan, Weishi] H;Huaiyin Inst Technol, Fac Appl Technol, Huaian 223003, Peoples R China.;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Commun & Elect Engn, Yiyang 413002, Peoples R China.

关键词： Binary alloys;Heat treatment;Iron alloys;Iron metallography;Magnetostriction;Magnetostrictive devices;Synchrotron radiation;Tin;X ray diffraction analysis;As-spun ribbons;High-resolution x-ray diffraction;Magnetostrictive properties;Rapid cooling;Rich phase;Slow cooling;Sn contents;Tetragonal distortion;Tin metallography

摘要： (Fe0.82Ga0.18)100−xSnx (x = 0, 1, 2, 3, 4) ribbons were prepared and heat treated. The microstructure was studied using high-resolution X-ray diffraction (HRXRD) in synchrotron radiation lab. The results showed that Sn doping can effectively enhance the magnetostriction of Fe–Ga-based ribbons. In the samples with less Sn doping, the precipitated modified-DO3 (M-DO3) phase emerged and enhanced the magnetostrictive property. As Sn content increased, Sn-rich phase, FeSn, and FeSn2 precipitated and weakened the magnetostrictive properties. Heat treatment can promote the large tetragonal distortion which was suppressed by Sn doping in as-spun ribbons. It was found that rapid cooling enhanced the magnetostriction, but slow cooling had opposite effect. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： 张赛文;曹艳青;冷潇泠;谭伟石

期刊： 湖南城市学院学报(自然科学版),2021年30(01):60-64 ISSN：1672-7304

作者机构： 湖南城市学院信息与电子工程学院,湖南 益阳 413000;全固态储能材料与器件湖南省重点实验室,湖南 益阳 413000;[冷潇泠; 谭伟石; 张赛文; 曹艳青] 湖南城市学院信息与电子工程学院<&wdkj&>全固态储能材料与器件湖南省重点实验室

关键词： 单分子定位;超分辨显微成像;极大似然法;点扩展函数

摘要： 由于光的衍射极限限制,人们无法观察精细的细胞结构和获得纳米级的蛋白质以及生物分子信息.本研究采用极大似然算法来实现单分子定位.首先,对荧光分子图像进行解卷积和二值化处理降噪;其次,对荧光显微成像过程建立极大似然模型;最后,用优化工具箱函数进行求解.模拟结果表明:相邻20 nm的2条分子带可以分辨;将此算法应用于实际生物样品的超分辨成像时,原本不能区别的2条微丝可以进行区分,且分辨能力得到了提高;极大似然法可以很好地完成分子定位,进而实现超分辨图像的重构.

语种： 中文

作者： Zhang, Zhengzhong;Liu, Hao;Wang, Chao;Zhang, Qingyun;Tan, Weishi

期刊： Physics Letters A,2021年399:127297 ISSN：0375-9601

通讯作者： Hao Liu

作者机构： [Liu, Hao; Zhang, Zhengzhong; Wang, Chao] Huaiyin Inst Technol, Fac Math & Phys, Huaian 223003, Peoples R China.;[Zhang, Qingyun] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Peoples R China.

通讯机构： [Hao Liu] F;Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, China

关键词： Quantum dot;Spin-dependent Seebeck effect;Charge-Seebeck effect

摘要： A spin-dependent Seebeck diode is theoretically proposed, which consists of the junction with a semiconductor quantum dot sandwiched between the ferromagnetic and nonmagnetic leads. It is shown that both thermoelectric and thermal-spin currents driven by temperature bias exhibit asymmetric I-C(S)- Delta T characteristics. In the Coulomb blockade regime, anomalous suppression of the thermoelectric (thermal-spin) current is observed at the forward thermal bias direction (Delta T > 0). This asymmetry in the current profile suggests a diode-like behavior with respect to temperature bias. More interesting, the diode behavior of both thermoelectric and thermal-spin currents can be switched and even reversed by tuning the gate voltage, which may be facilely realized in experiments. This device scheme can be compatible with current technologies and has potential applications in spintronics or quantum processing. (C) 2021 Elsevier B.V. All rights reserved.

语种： 英文

作者： Ma, Chunlin;Wang, Xingyu;Tan, Weishi*;Zhou, Weiping*;Wang, Xiaoxiong;...

期刊： DALTON TRANSACTIONS,2020年49(17):5581-5589 ISSN：1477-9226

通讯作者： Tan, Weishi;Zhou, Weiping

作者机构： [Chen, Guibin; Zhai, Zhangyin; Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Wang, Xingyu; Wang, Xiaoxiong; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Peoples R China.;[Tan, Weishi] Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.;[Cheng, Zhenzhi; Zhou, Weiping] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.

通讯机构： [Tan, Weishi] H;[Zhou, Weiping] N;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.;Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.

摘要： Sm3+-Modified (1 −x)Na0.5Bi0.5TiO3-xCaTiO3(NBT-xCT:Sm3+) piezo-luminescent ceramic materials were synthesized to investigate the influence of CaTiO3(CT) concentration on their photoluminescence and electrical performance. Under 480 nm irradiation, the NBT-xCT:Sm3+samples exhibit prominent orange-red emission, with a prime emission peak centered at 597 nm. A moderate amount of CT doping in the Sm3+-modified NBT ceramics boosts both their photoluminescence and piezoelectric properties significantly, with NBT-0.04CT:Sm3+showing the optimal performance. Furthermore, outstanding luminescence thermal stability over a temperature range of 293-473 K and superior water resistance behavior are achieved in the NBT-0.04CT:Sm3+ceramic. These results indicate that NBT-xCT:Sm3+piezo-luminescent ceramics show great potential applications in white LEDs, as well as novel optical-electronic multifunctional devices. © The Royal Society of Chemistry 2020.

语种： 英文

作者： Wang, Haiou*;Tan, Weishi

期刊： AIP Advances,2020年10(9):095113 ISSN：2158-3226

通讯作者： Wang, Haiou

作者机构： [Wang, Haiou] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices, Key Lab Hunan Prov, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Minist Educ, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.

通讯机构： [Wang, Haiou] H;Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.

摘要： Magnetic anisotropy plays an important role in the development of manganite-based magnetic devices. Establishing a deeper understanding of the anisotropy in manganites is useful for controlling their magnetic properties. We have studied the structure, lattice strain, and magnetic properties of La0.5Ba0.5MnO3 (LBMO-5) films with the thickness of 12 nm-96 nm, grown on the (001) SrTiO3 (STO) substrate. The LBMO-5 films are grown with high crystalline quality. The orientation relationship between the LBMO-5 film and the STO substrate [(001)f//(001)s, (010)f//(010)s, and (100)f//(100)s] exists at the film/substrate interface. With increasing the thickness of the film to 48 nm, the LBMO-5 film is fully strain relaxed. The LBMO-5 film shows the out-of-plane magnetic anisotropy (OMA) along the three mutually perpendicular crystalline axis directions. Usually, the manganite films with tetragonal distortion show both the OMA and the in-plane magnetic isotropy. However, the in-plane magnetic anisotropy (IMA) along the two mutually perpendicular in-plane directions ([010]f and [100]f) is clearly observed in LBMO-5 films. We attribute this new observation of the IMA to the in-plane structural anisotropy along the two distinct crystalline axes. Our studies provide helpful guidance for the understanding and the tuning of the IMA. © 2020 Author(s).

语种： 英文

作者： 祝秋香;简正波;谭伟石;肖卫初;邓亚琦;...

期刊： 湖南城市学院学报(自然科学版),2020年29(04):56-61 ISSN：1672-7304

作者机构： 湖南城市学院 信息与电子工程学院,湖南益阳 413000;湖南城市学院 全固态储能材料与器件湖南省重点实验室,湖南益阳 413000;湖南城市学院 机械与电气工程学院,湖南益阳 413000;[肖卫初; 谭伟石; 林琳; 邓亚琦; 祝秋香; 张林成; 简正波; 崔治] 湖南城市学院

关键词： ZnO微米碟;表面等离激元;紫外发光

摘要： 利用简单气相传输法制备ZnO微米碟,通过在其表面溅射一层Au纳米粒子,构建Au与ZnO的复合结构,详细探讨ZnO微米碟的紫外发光增强性能及Au表面等离激元与ZnO激子的耦合过程和耦合机制.研究结果表明,溅射Au纳米颗粒使室温下生长的ZnO微米碟的紫外发光增强了近10倍;Au与ZnO的复合结构中存在ZnO近带边发光增强和缺陷发光被抑制的2个物理过程;在Au与ZnO的耦合过程中,能量耦合与电子转移共同存在.

语种： 中文

作者： 冷潇泠;田野;林丹樱;于斌;谭伟石;...

期刊： 中国光学,2020年13(5):1065-1074 ISSN：2095-1531

通讯作者： Yu, Bin(yubin@szu.edu.cn)

作者机构： [张赛文; 冷潇泠; 张光富; 田野; 谭伟石] School of Information and Electronics Engineering, Hunan City University, Yiyang;413000, China;All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province, Hunan City University, Yiyang;[林丹樱; 于斌] Key Laboratory of Optoelectronic Devices and Systems of Ministry and Education and Guangdong Province, College of Physics and Optoelectronics Engineering, Shenzhen University, Shenzhen;518060, China

通讯机构： [Yu, B.] K;Key Laboratory of Optoelectronic Devices and Systems of Ministry and Education and Guangdong Province, China

关键词： 压缩感知;单分子定位;图像重构;同伦算法

摘要： 本文建立了一种三维压缩感知模型以实现对高密度荧光分子图像的快速三维定位。首先，根据荧光显微的三维点扩展函数成像理论，设计测量矩阵，并建立压缩感知模型。接着，对荧光显微成像过程进行了模拟，并采用凸优化方法（CVX）、正交匹配追踪（Orthogonal Matching Pursuit，OMP）算法和同伦算法对建立的压缩感知模型中模拟生成的图像进行了定位分析，分别从恢复率、定位精度、重构时间几方面进行了对比。最后，采用同伦算法对模拟的生物样品和实验室采集的细胞进行了三维定位，并获得了三维超分辨图像。对比结果表明：在重构密度和定位精度接近的情况下，同伦算法比CVX方法的重构速度快2个数量级。同伦算法较OMP算法的定位精度要高一倍。采用同伦算法来实现三维的超分辨荧光显微成像在节约计算时间、实现实时成像方面具有一定的意义。 In order to achieve fast three-dimensional localization of high-density fluorescent molecular images, a three-dimensional compressed sensing model was established and studied using the CVX method, the Orthogonal Matching Pursuit(OMP) algorithm and a homotopy algorithm. The models’ measurement matrix was then designed. Firstly, the system’s theory and design were both developed using the three-dimensional point-spread function imaging theory of fluorescence microscopy. Then, the process of fluorescence microscopic imaging was simulated, through which the images generated in the established compressed sensing model were analyzed using the CVX method, OMP algorithm and homotopy algorithm. The recall rate, localization accuracy and reconstruction time were compared. Finally, the simulated biological samples and the collected cells in the laboratory were analyzed using the homotopy algorithm, and thus three-dimensional super-resolution imaging was achieved. It can be seen from the comparative results that the homotopy algorithm is two orders of magnitude faster than the CVX method when the reconstruction density and localization accuracy have little deviation. The localization accuracy of the homotopy algorithm is twice higher than that of the OMP algorithm. The homotopy algorithm is meaningful for 3D super-resolution fluorescence microscopy imaging, which can save computing time and achieve real-time imaging.

语种： 中文

作者： Wang, Haiou*;Zhang, Hui;Su, Kunpeng;Huang, Shuai;Tan, Weishi*;...

期刊： Journal of Materials Science: Materials in Electronics,2020年31(17):14421-14425 ISSN：0957-4522

通讯作者： Wang, Haiou;Tan, Weishi

作者机构： [Su, Kunpeng; Wang, Haiou; Zhang, Hui; Huang, Shuai; Huo, Dexuan] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.

通讯机构： [Wang, Haiou; Tan, Weishi] H;[Tan, Weishi] N;Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.

关键词： Ball milling;Colossal magnetoresistance;Crystal structure;High temperature applications;Hysteresis;Magnetic materials;Manganese oxide;Manganites;Milling (machining);Morphology;Perovskite;Phase separation;Remanence;Samarium compounds;Scanning electron microscopy;Solid state reactions;Surface morphology;Average particle size;Ball milling time;Charge ordering;Colossal magnetoresistance effect;Different particle sizes;High temperature solid-state reaction;Orthorhombic structures;Thermal hysteresis;Particle size

摘要： Half-doped perovskite Manganese oxide has been widely studied because of its excellent properties such as colossal magnetoresistance (CMR) effect and charge-ordered (CO) phase separation. In this work, four Sm0.5Ca0.5MnO3 samples with different particle sizes are prepared by high-temperature solid-state reaction and ball milling. The crystal structure of the samples is studied by X-ray diffraction (XRD). The Sm0.5Ca0.5MnO3 sample is single phase, which belongs to orthorhombic structure. The surface morphology and particle size of the samples are examined by scanning electron microscope (SEM). The average particle size of the sample without ball milling is about 4μm. With ball milling time for 12h, 24h, and 36h, the particle size decreases, and finally it reaches hundreds to tens of nanometers. This shows that ball milling is an effective way to control the particle size. The M–T curves and M–H hysteresis loops of the samples are measured by physical properties measurements systems (PPMS). The two M–T curves measured in the warming and cooling processes do not overlap for Sm0.5Ca0.5MnO3 without ball milling, and the phenomenon of thermal hysteresis appears. Meanwhile, the M–T curve has a significant protuberance peak near 270K. All of these indicate the CO behavior, whereas the particle size of Sm0.5Ca0.5MnO3 decreases with different milling times (12–36h) and the CO phase is suppressed gradually, which leads to the decrease of CO temperature, magnetization, remanence, and coercivity. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： 邓亚琦;谭伟石;祝秋香;郭赛球

期刊： 湖南城市学院学报(自然科学版),2020年29(05):52-57 ISSN：1672-7304

作者机构： 湖南城市学院 信息与电子工程学院,湖南 益阳 413000;湖南城市学院 全固态储能材料与器件湖南省重点实验室,湖南 益阳 413000;[谭伟石; 祝秋香; 邓亚琦] 湖南城市学院;[郭赛球] 湖南省城市学院

关键词： 外辐射源雷达;机载雷达;杂波抑制;匹配补偿函数

摘要： 针对机载外辐射源雷达传统微弱目标检测方法运算量大、机动目标探测能力下降的问题,提出了机载外辐射源雷达微弱机动目标检测新方法.该方法首先对均匀分段、匹配滤波后的两通道信号进行参考信号多普勒补偿,并结合DPCA(Displaced Phase Center Antenna)技术实现杂波对消;然后采用Keystone变换校正径向速度引起的距离走动;最后应用匹配补偿函数解决径向加速度导致的目标能量分散问题.仿真结果表明,所提方法在Keystone变换之前抑制了杂波,克服了各通道进行Keystone变换导致的复杂度大的问题;匹配补偿函数的应用提高了机动目标的探测能力.

语种： 中文

作者： Ma, Chunlin;Zhou, Weiping*;Chen, Guibin;Cheng, Ju;Zhai, Zhangyin;...

期刊： Journal of Luminescence,2020年228:117636 ISSN：0022-2313

通讯作者： Zhou, Weiping;Tan, Weishi

作者机构： [Chen, Guibin; Cheng, Ju; Zhai, Zhangyin; Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Zhou, Weiping] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Wang, Xiaoxiong; Wang, Xingyu; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Peoples R China.

通讯机构： [Zhou, Weiping] N;[Tan, Weishi] H;Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.

关键词： Electric fields;Ferroelectric ceramics;Ferroelectricity;Optoelectronic devices;Phase boundaries;Piezoelectric ceramics;Electric field induced;Electric field poling;Lattice distortions;Lead-free ferroelectric ceramics;Morphotropic phase boundaries;Photoluminescence intensities;Photoluminescence response;Structural instability;Photoluminescence

摘要： Luminescent ions doped lead free ferroelectric ceramics are the potential candidates to the widespread application of optoelectronic devices due to the coupling between their unique photoluminescence and inherent ferroelectric performance. In this work, the tunable photoluminescence response is successfully achieved in (1-x)Na0·5Bi0·5TiO3-xCaTiO3: Eu3+ (NBT-xCT: Eu3+, x=0.07, 0.1) via electric field poling. It is found that the enhancement of photoluminescence intensity became apparent for polarized NBT-0.07CT: Eu3+, wherein x=0.07 is near the morphotropic phase boundary region. However, for NBT-0.1CT: Eu3+ ceramic with a morphotropic phase boundary, the variation trend of the emission intensity after electric field poling is opposite. These results are ascribed to the lattice distortion and phase transition induced by an external field poling, which originates from ferroelectric and structural instability near and in the morphotropic phase boundary of NBT-xCT: Eu3+ (x=0.07, 0.1) ceramics. © 2020 Elsevier B.V.

语种： 英文

作者： Wang, Haiou;Su, Kunpeng;Huang, Shuai;Ge, Jingyuan;Tan, Weishi*;...

期刊： Journal of Superconductivity and Novel Magnetism,2019年32(12):3887-3891 ISSN：1557-1939

通讯作者： Huo, Dexuan;Tan, Weishi

作者机构： [Su, Kunpeng; Wang, Haiou; Huang, Shuai; Ge, Jingyuan; Huo, Dexuan] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.

通讯机构： [Huo, Dexuan; Tan, Weishi] H;[Tan, Weishi] N;Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.

关键词： Antiferromagnetism;Frequency modulation;Hysteresis;Hysteresis loops;Lanthanum compounds;Magnetic properties;Manganese compounds;Manganites;Perovskite;Phase transitions;Scanning electron microscopy;Temperature measurement;Characteristic temperature;Charge ordering;Charge-ordered antiferromagnetic;Ferromagnetic transitions;Magnetic phase transitions;Orthorhombic structures;Perovskite manganites;Polycrystalline;Magnetic materials

摘要： In this work, we report the attractive magnetic properties of La1-xCaxMnO3 manganites with x = 0.2 (LCMO-2) and x = 0.5 (LCMO-5). X-ray diffraction (XRD) measurements show that the prepared samples are single phase and they crystallize in the orthorhombic structure with Pnma space group. Scanning electron microscope (SEM) measurements reveal that the particles of samples are homogeneous and possess the diameter of several microns. Magnetization versus temperature measurements show paramagnetic (PM) to ferromagnetic (FM) transition at TC ≈ 200K for LCMO-2 and at TC ≈ 250K for LCMO-5. Below TC, FM nature is observed in LCMO-2. However, LCMO-5 displays the complex magnetic phase transition. Below TC, LCMO-5 shows a FM to charge-ordered antiferromagnetic (COAFM) transition at CO temperature TCO and a novel, unexpected FM phase transition at characteristic temperature T* (near 35K). The FM and COAFM phases coexist in LCMO-5, and the competition of FM and AFM phases lead to the unexpected FM transition at T*. Furthermore, the inverse of susceptibility versus temperature measurements confirm the similar results. Magnetic hysteresis loop measurements suggest the typical FM feature of LCMO-2. However, LCMO-5 exhibits the hysteresis loops with butterfly-type structure at 100 and 150K, suggesting the presence of COAFM phase. These attractive magnetic properties are explained by the existence of COAFM phase and the competition between FM and COAFM phases. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： Ma, Chunlin;Wang, Xingyu;Gan, Zhixing;Tan, Weishi*;Wang, Xiaoxiong;...

期刊： Ceramics International,2019年45(1):588-594 ISSN：0272-8842

通讯作者： Tan, Weishi;Zhou, Weiping

作者机构： [Wang, Xingyu; Wang, Xiaoxiong; Zhou, Weiping; Tan, Weishi; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;[Ma, Chunlin; Zhang, Jia] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Gan, Zhixing] Nanjing Normal Univ, Sch Phys & Technol, Key Lab Optoelect Technol Jiangsu Prov, Nanjing 210023, Jiangsu, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.

通讯机构： [Tan, WS; Zhou, WP] N;Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.

关键词： Photoluminescent properties;Ba0.85Ca0.15Ti0.90Zr0.10O3;Multifunctional materials;Optical temperature sensing

摘要： A series of orange-red emitting Sm3+ activated Ba0.85Ca0.15Ti0.90Zr0.10O3 (BCZT: xSm3+, x = 0.001–0.007) are synthesized by a conventional solid-state reaction method. The Sm3+ ions composition dependent photoluminescence properties are systematically investigated. Under the excitation of a 407 nm near-ultraviolet light, the ceramics exhibit strong characteristic emission of Sm3+ ions with dominant orange-red emission peak at around 595 nm, which is ascribed to the transition of 4G5/2 → 6H7/2. The BCZT: 0.004Sm3+ ceramic displays the optimal emission among these Sm3+-doped BCZT solid solutions. Moreover, the photoluminescence intensity exhibits extremely sensitive to temperature, suggesting that BCZT: 0.004Sm3+ could be applicable for temperature sensing. A maximum relative sensitivity of 1.89% K−1 at 453 K is obtained. Furthermore, the existence of ferroelectricity in the BCZT host combined with Sm3+ activated photoluminescence properties could be useful for developing optical-electro multifunctional materials and devices. © 2018 Elsevier Ltd and Techna Group S.r.l.

语种： 英文

作者： Liu, H.;Zhang, Z. Z.;Wu, Y. J.;Dong, L. M.;Wang, H. O.;...

期刊： Journal of Materials Science: Materials in Electronics,2019年30(20):18780-18787 ISSN：0957-4522

通讯作者： Liu, H

作者机构： [Liu, H.; Zhang, Z. Z.] Huaiyin Inst Technol, Fac Appl Technol, Huaian 223001, Peoples R China;[Wu, Y. J.] Fudan Univ, Inst Mol Mat & Devices, Dept Mat Sci, Shanghai 200438, Peoples R China;[Dong, L. M.] Changshu Inst Technol, Sch Automat Engn, Changshu 215500, Jiangsu, Peoples R China;[Wang, H. O.] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China;[Cao, M. X.] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

通讯机构： [Liu, H.] H;Huaiyin Inst Technol, Fac Appl Technol, Huaian 223001, Peoples R China.

关键词： Extended X ray absorption fine structure spectroscopy;Gallium alloys;Iron alloys;Melt spinning;Saturation magnetization;Ternary alloys;Textures;X ray absorption;X ray diffraction analysis;Body-centred cubic;Extended Xray absorption fine structure (EXAFS) spectroscopies;Face-centred cubic;High-resolution x-ray diffraction;Magnetostrictive properties;Metallurgical microscope;Precipitated phase;Unit-cell volume;Nickel

摘要： A set of Ni doping Fe–Ga ribbons were fabricated using melt spinning method. The microstructure was studied using extended X-ray absorption fine structure spectroscopy (EXAFS), high resolution X-ray diffraction (HRXRD) and metallurgical microscope. The results of microstructure indicated that as Ni concentration increased, the lattice matrix transformed from body-centred cubic (bcc) to face-centred cubic (fcc), with the decrease of unit cell volume and the emergence of little amount B2 and E21 phase. The result of magnetic and magnetostrictive properties showed that the saturation magnetization decreased with Ni doping. (110) texture in studied ribbons resulted in low saturation magnetic field and high saturation magnetostrction. In addition, small amount of precipitated phase E21 improved the magnetostricion of FeNiGa ribbons. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： Ma, Chunlin;Zhou, Weiping*;Gan, Zhixing;Wang, Xingyu;Tan, Weishi*;...

期刊： Journal of Alloys and Compounds,2019年794:325-332 ISSN：0925-8388

通讯作者： Zhou, Weiping;Tan, Weishi

作者机构： [Wang, Xingyu; Zhou, Weiping; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;[Zhai, Zhangyin; Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Zhou, Weiping] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.;[Gan, Zhixing] Nanjing Normal Univ, Key Lab Optoelect Technol Jiangsu Prov, Sch Phys & Technol, Nanjing 210023, Jiangsu, Peoples R China.;[Tan, Weishi] Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.

通讯机构： [Zhou, Weiping] N;[Tan, Weishi] H;Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Informat & Elect Engn, Yiyang 413002, Peoples R China.

关键词： Binary alloys;Crystallography;Ferroelectricity;Optoelectronic devices;Photoluminescence;Piezoelectric ceramics;Piezoelectric materials;Piezoelectricity;Quenching;Electric field poling;Ferroelectric polarization;Field-induced structural transformation;Photoluminescence quenching;Piezoelectric;Piezoelectric constant;Poling electric fields;Quenching phenomena;Electric lines

摘要： Luminescent piezoelectric materials promise a stratagem for controlling the optical process by electric field, which would benefit for future optoelectronic devices. Here, Er3+ doped (Ba0.85Ca0.15) (Zr0.1Ti0.9)O3 (BCZT: Er3+) piezoelectric ceramics are prepared to demonstrate the proof of concept. In addition to excellent intrinsic piezoelectricity and ferroelectricity, BCZT: Er3+ ceramics exhibit simultaneously strong green upconversion emissions under excitation of 980 nm. Remarkable photoluminescence (PL) quenching phenomenon as well as significant changes on relative intensities of stark lines are observed under external poling electric field. Furthermore, field dependent piezoelectric constant d33 and photoluminescence quenching ratio show similar variation trend and finally saturate for E &gt; 3.5 kV/mm, which provides a noncontact strategy to monitor the piezoelectric constant d33. The PL quenching triggered by electric field in BCZT: Er3+ ceramics is ascribed to the decreased asymmetry originating from field-induced structural transformation from a significant fraction of the tetragonal phase to rhombohedral phase. Our work would be helpful for expanding the scope of luminescent piezoelectric materials and promising future optoelectronic and optical devices with cross-coupled physical properties. © 2019 Elsevier B.V.

语种： 英文

作者： Wang, H. O.;Zhao, P.;Sun, J. J.;Tan, W. S.*;Su, K. P.;...

期刊： Journal of Materials Science: Materials in Electronics,2018年29(15):13176-13179 ISSN：0957-4522

通讯作者： Huo, D. X.;Tan, W. S.

作者机构： [Wang, H. O.; Zhao, P.; Huang, S.; Huo, D. X.; Su, K. P.; Sun, J. J.] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.;[Tan, W. S.] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Tan, W. S.] Nanjing Univ Sci & Technol, Dept Appl Phys, Minist Educ, Key Lab Soft Chem & Funct Mat, Nanjing 210094, Jiangsu, Peoples R China.

通讯机构： [Huo, D. X.; Tan, W. S.] H;[Tan, W. S.] N;Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;Nanjing Univ Sci & Technol, Dept Appl Phys, Minist Educ, Key Lab Soft Chem & Funct Mat, Nanjing 210094, Jiangsu, Peoples R China.

关键词： Calcium compounds;Ferromagnetic materials;Ferromagnetism;Manganese compounds;Manganites;Solid state reactions;Charge ordering;Charge-ordered state;Ferromagnetic transitions;Magnetic response;Polycrystalline samples;Solid state reaction method;Temperature dependent magnetization measurement;Zero-field cooling;Lanthanum compounds

摘要： La0.5Ca0.5MnO3 (LCMO) polycrystalline sample was synthesized by the solid-state reaction method. The result of X-ray diffraction shows that the LCMO is single phase. We have studied the magnetic response of charge-ordered (CO) state in the LCMO manganite. The magnetic hysteresis loop at 100K displays an interesting butterfly-type structure, which indicates the existence of CO anti-ferromagnetic (AFM) structure in LCMO. The temperature-dependent magnetization measurements show a paramagnetic (PM) to ferromagnetic (FM) transition at Curie temperature (TC ≈ 130K) and a FM to AFM transition at Néel temperature (TN ≈ 50K), measured under different fields of 100, 500 and 5000Oe. Moreover, there is an interesting intercross in zero-field cooling (ZFC) and filed-cooling (FC) measurements, i.e., an intercross of the ZFC/FC curves in the CO LCMO manganite. These present magnetism measurements are discussed and possible explanations are provided by the existence of CO AFM state. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： Cao Mengxiong;Wang Xingyu;Ma Yaru;Ma Chunlin;Zhou Weiping*;...

期刊： 物理化学学报,2018年34(4):437-444 ISSN：1000-6818

通讯作者： Zhou Weiping;Tan Weishi

作者机构： [Zhou Weiping; Tan Weishi; Ma Yaru; Wang Xingyu; Wang Xiaoxiong; Cao Mengxiong; Ma Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Dept Appl Phys, Key Lab Soft Chem & Funct Mat,Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.;[Wang Haiou] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.;[Tan Weishi] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Hunan, Peoples R China.

通讯机构： [Zhou, WP; Tan, WS] N;[Tan Weishi] H;Nanjing Univ Sci & Technol, Sch Sci, Dept Appl Phys, Key Lab Soft Chem & Funct Mat,Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.;Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Hunan, Peoples R China.

关键词： RSM

摘要： The MgO(110) single crystals were neutron-irradiated with different doses ranging from 1.0×1016 to 1.0×1020 cm−2. The isointensity profiles of the X-ray diffuse scattering caused by the cubic and double-force point defects in MgO were calculated on the basis of the Huang scattering theory. The X-ray diffuse scattering and the UV-Vis absorption spectra were recorded to investigate the point defect configurations in the MgO(110) crystals. Furthermore, the magnetic properties were characterized by a superconducting quantum interference device magnetometer. The ω–2θ curves and rocking curves implied that neutron irradiation enhanced the lattice distortion. The point defects were produced in irradiated MgO crystals. The measured reciprocal space mappings (RSMs) revealed that the notable diffuse scattering was presented in irradiated MgO. Compared with the calculated diffuse scattering intensity profile, it was evident that Frenkel defects were introduced in the irradiated samples. The UV-Vis spectra indicated that anion O vacancy defects had been introduced in irradiated MgO. The single vacancies could be aggregated in irradiated samples with higher doses (1.0×1019 and 1.0×1020 cm−2). Although the irradiated MgO(110) single crystals were diamagnetic at room temperature, they became ferromagnetic at low temperature. The maximum saturation magnetization was found to be 0.058 emu·g−1. By means of neutron irradiation, defect-mediated ferromagnetism could be achieved at low temperature. The correlation between ferromagnetism and O vacancies in neutron-irradiated MgO could be described using F-center exchange mechanism. © Editorial office of Acta Physico-Chimica Sinica.

语种： 英文

作者： Ma, Chunlin;Wang, Xingyu;Cao, Mengxiong;Ma, Yaru;Tan, Weishi*;...

期刊： Journal of Materials Science: Materials in Electronics,2018年29(20):17818-17825 ISSN：0957-4522

通讯作者： Zhou, Weiping;Tan, Weishi

作者机构： [Wang, Xingyu; Zhou, Weiping; Ma, Yaru; Cao, Mengxiong; Ma, Chunlin] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;[Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Fang, Yong] Changshu Inst Technol, Dept Phys, Jiangsu Lab Adv Funct Mat, Changshu 215500, Jiangsu, Peoples R China.

通讯机构： [Zhou, Weiping] N;[Tan, Weishi] H;Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.

关键词： Ferromagnetic materials;Ferromagnetism;Magnetic moments;Magnetic properties;X ray photoelectron spectroscopy;Antiphase boundaries;Double perovskite oxide;Exchange bias effects;Exchange-bias fields;Ferromagnetic regions;Ferromagnetic transition temperatures;Interfacial exchange coupling;Structural and magnetic properties;Perovskite

摘要： The structural and magnetic properties of Y2−xSrxCoMnO6 (0 ≤ x ≤ 0.5) compounds are investigated in this report. X-ray photoelectron spectroscopy reveals that Co and Mn ions are presented in the form of Co2+/Co3+ and Mn3+/Mn4+, respectively. The broadening of Raman spectra suggests the existence of antisite disorders in these double perovskite oxides. The ferromagnetic transition temperature slightly increases with Sr doping, while the saturated magnetic moment shows a substantial decrease, further confirming the presence of Co/Mn antisite disorders. The signature of exchange bias effect in Y2−xSrxCoMnO6 (0 ≤ x ≤ 0.5) double perovskites has been observed, which is demonstrated by the displacement of field-cooled magnetic hysteresis loops. Moreover, the exchange bias field is strongly correlated with the degree of antisite disorders and reaches a maximum of 3.4kOe for x = 0.25. The origin of exchange bias effect can be explained as the interfacial exchange coupling between ferromagnetic regions and antiferromagnetic antiphase boundaries created by antisite disorders in these specimens. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： Wang, Haiou*;Tan, Weishi;Hao, Liu;Cao, Mengxiong;Wang, Xingyu;...

期刊： APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2017年123(3):1-6 ISSN：0947-8396

通讯作者： Wang, Haiou

作者机构： [Wang, Haiou] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Col Commun & Elect Engn, Yiyang 413002, Peoples R China.;[Wang, Xingyu; Tan, Weishi; Cao, Mengxiong; Ma, Chunlin] Nanjing Univ Sci & Technol, Minist Educ, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Nanjing 210094, Jiangsu, Peoples R China.;[Hao, Liu] Suzhou Inst Ind Technol, Dept Elect & Commun Engn, Suzhou 215104, Peoples R China.;[Jia, Quanjie] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.

通讯机构： [Wang, Haiou] H;Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.

关键词： Manganite;Lattice Strain;Strain Relaxation;Tetragonal Distortion;Grazing Incidence Angle

摘要： Perovskite manganite La0.5Ba0.5MnO3 (LBMO) films were deposited on (001)-oriented single-crystal SrTiO3 (STO) substrates by pulsed laser deposition. High-resolution X-ray diffraction and grazing incidence X-ray diffraction techniques were applied to characterize the crystal structure and lattice strain of LBMO films. The in-plane and out-of-plane growth orientations of LBMO films with respect to substrate surface have been studied. The epitaxial orientation relationship LBMO (001) [100] //STO (001) [100] exists at the LBMO/STO interface. The lattice strain of LBMO film begins to relax with the thickness of LBMO film up to 12nm. When the thickness is further increased up to 43nm, the film is in fully strain-relaxed state. Jahn–Teller strain plays an important role in LBMO/STO system. The mechanism for strain relaxation is in accordance with that of tetragonal distortion. © 2017, Springer-Verlag Berlin Heidelberg.

语种： 英文

作者： Wang, H. O.*;Liu, H.;Cao, M. X.;Wang, X. Y.;Tan, W. S.*;...

期刊： Journal of Materials Science: Materials in Electronics,2017年28(8):6233-6238 ISSN：0957-4522

通讯作者： Wang, H. O.;Tan, W. S.

作者机构： [Wang, H. O.] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.;[Wang, X. Y.; Ma, C. L.; Cao, M. X.; Liu, H.; Tan, W. S.] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.;[Tan, W. S.] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Peoples R China.;[Xu, F.] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China.;[Jia, Q. J.] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.

通讯机构： [Wang, H. O.; Tan, W. S.] H;[Tan, W. S.] N;Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.;Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.;Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Peoples R China.

关键词： Calcium;Magnetoresistance;Manganese oxide;Manganites;Metal insulator transition;Phase separation;Praseodymium;Pulsed laser deposition;Solvents;Temperature;Charge ordering;Low temperatures;Non-uniformities;Percolation models;Research results;Superlattice periods;Transport mechanism;Wide temperature ranges;Enhanced magnetoresistance

摘要： [Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3]20 superlattices were epitaxially fabricated on (001) MgO substrates with 24nm La0.5Ca0.5MnO3 (LCMO) buffer layer by pulsed laser deposition. As the thickness of Pr0.7Sr0.3MnO3 (PSMO) layer and LCMO layer is not identical, non-uniformity in the superlattice period thickness will occur and result in lower metal–insulator transition temperature and larger magnetoresistance (MR) at a wide low-temperature range. Furthermore, the percolation model was used to quantitatively understand the transport mechanism of superlattice. Our research results demonstrate that inhomogeneous layer thickness accompanied with charge ordering phase separation can strongly influence the transport properties of superlattice. Enhanced magnetoresistance at a wide temperature range provides possibilities for practical application in manganite-based film devices. © 2017, Springer Science+Business Media New York.

语种： 英文

作者： 马亚茹;曹梦雄;王兴宇;马春林;周卫平;...

期刊： 热加工工艺,2017年46(22):149-151,154 ISSN：1001-3814

作者机构： [马亚茹; 曹梦雄; 王兴宇; 马春林; 周卫平; 谭伟石] 南京理工大学理学院应用物理系, 软化学与功能材料教育部重点实验室, 江苏, 南京, 210094

关键词： Fe_(81)Ga_(19)薄膜;RF 磁控溅射;溅射功率;微观结构;磁性

摘要： 采用射频磁控溅射技术在SrTiO_3(100)衬底上制备Fe_(81)Ga_(19)薄膜。利用XRD、AFM和VSM表征了Fe_(81)Ga_(19)薄膜的生长取向、内应力、表面形貌和磁性,研究了不同溅射功率(60~100 W)对Fe_(81)Ga_(19)薄膜结构和磁性能的影响。结果表明,所有薄膜主要以A_2相和L_(12)相存在。随着溅射功率的增大,A_2相衍射峰的强度缓慢降低,内应力显著增加,表面粗糙度降低,薄膜的剩余磁化强度和饱和磁化强度明显减小,而矫顽力保持不变,都为50 Oe。

语种： 中文