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Point Defects Induced Ferromagnetism in Neutron Irradiated Mg0(110) Single Crystals

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成果类型:
期刊论文
论文标题(中文):
点缺陷引起中子辐照MgO(110)单晶的铁磁性(英文)
作者:
曹梦雄;王兴宇;马亚茹;马春林;周卫平;王晓雄;王海欧;谭伟石
通讯作者:
Zhou Weiping;Tan Weishi
作者机构:
[马亚茹; 周卫平; 王兴宇; 王晓雄; 曹梦雄; 谭伟石; 马春林] Nanjing Univ Sci & Technol, Sch Sci, Dept Appl Phys, Key Lab Soft Chem & Funct Mat,Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.
[谭伟石] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Hunan, Peoples R China.
[王海欧] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Zhejiang, Peoples R China.
通讯机构:
[Zhou Weiping; Tan Weishi] Nanjing Univ Sci & Technol, Sch Sci, Dept Appl Phys, Key Lab Soft Chem & Funct Mat,Minist Educ, Nanjing 210094, Jiangsu, Peoples R China.
[Tan Weishi] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413002, Hunan, Peoples R China.
语种:
英文
关键词:
MgO single crystal;Neutron irradiation;Point defect;d(0) ferromagnetism;RSM;Color center
关键词(中文):
MgO单晶;中子辐照;点缺陷;d0铁磁性;色心
期刊:
ACTA PHYSICO-CHIMICA SINICA
期刊(中文):
物理化学学报
ISSN:
1000-6818
年:
2018
卷:
34
期:
4
页码:
437-444
文献类别:
WOS:Article
所属学科:
ESI学科类别:化学;WOS学科类别:Chemistry, Physical
入藏号:
基金类别:
supported by the National Natural Science Foundation of China(U1332106,11604147,11604067); Scientific Research Innovation Projects of Jiangsu Province for University Graduate Students,China(CXLX13_179)~~;
机构署名:
本校为通讯机构
院系归属:
信息与电子工程学院
摘要:
The Mg0(110) single crystals were neutron-irradiated with different doses ranging from 1.0×10~(16) to 1.0×10~(20) 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 w~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 (1.0×10~(19) and 1.0×10~(20) cm~(-2)). Although the irradiated Mg0(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.
摘要(中文):
对Mg O(110)单晶进行中子辐照,辐照剂量从1.0×1016到1.0×1020 cm-2。基于黄昆漫散射理论,我们计算了Mg O晶体中的立方缺陷和偶极力缺陷引起的X射线漫散射强度分布图。通过X射线漫散射及紫外-可见光(UV-Vis)吸收光谱实验表征了晶体的点缺陷组态,并利用超导量子干涉仪(SQUID)测量了样品的磁性。ω–2θ和摇摆曲线说明Mg O单晶经中子辐照后产生了晶格畸变,晶体中存在一定浓度的点缺陷。倒易空间图(RSM)显示中子辐照的Mg O单晶存在漫散射现象。与计算得到的漫散射分布图对比分析可知,中子辐照的Mg O(110)单晶中产生了弗仑克尔缺陷。UV-Vis吸收光谱表明所有辐照晶体中存在阴离子单空位缺陷。辐照剂量较高(1.0×1019和1.0×1020 cm-2)的样品中存在O空位的聚集。磁性测量显示中子辐照后的Mg O(110)单晶在室温下依然是抗磁性,但在低温下具有铁磁性,最大饱和磁化强度达到0.058 emu·g-1。通过中子辐照的方法,可以使Mg O(110)单晶产生点缺陷引起的低温铁磁性。利用F色心交换机制可以解释中子辐照Mg O晶体中的O空位缺陷与铁磁性之间的关系。
参考文献:
Bachiller-Perea D, 2016, J MATER SCI, V51, P1456, DOI 10.1007/s10853-015-9465-3
Bhaumik S, 2014, IEEE T MAGN, V50, DOI 10.1109/TMAG.2013.2292575
Coey JMD, 2005, SOLID STATE SCI, V7, P660, DOI 10.1016/j.solidstatesciences.2004.11.012
Coey JMD, 2005, NAT MATER, V4, P173, DOI 10.1038/nmat1310
Das AK, 2016, J MAGN MAGN MATER, V404, P190, DOI 10.1016/j.jmmm.2015.12.032

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