(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 t...