Thermal expansion anomaly and spontaneous magnetostriction of Tb_2Fe_(15)Cr_2 compound  

作　　者：HAO Yanming ZHOU Yan ZHAO Miao 

机构地区：[1]Department of Physics, Tianjin Normal University, Tianjin 300074, China

出　　处：《Rare Metals》2006年第2期156-160,共5页稀有金属（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 50271022), the Excellent Young Teachers Program of MOE, China (No.1999), and the Tianjin Natural Science Foundation of China (No.043602011)

摘　　要：The structural and magnetic properties of Tb2Fe15CF2 compound were investigated by means of X-ray diffraction and magnetization measurements. Tb2Fe15Cr2 compound has a hexagonal Th2Ni17-type structure. Negative thermal expansion was found in Tb2Fe15Cr2 compound from 372 to 452 K by X-ray dilatometry. The coefficient of the average thermal expansion is α^- =-3.14×10^-5 K^-1. The magnetostrictive deformations from 292 to 450 K were calculated. The result showed that the spontaneous volume magnetostrictive deformation ms remains nearly constant with increasing temperature up to 360 K, but decreases with the further increase of temperature. The spontaneous linear magnetostrictive deformation λc along the c axis decreases with increasing temperature. The spontaneous linear magnetostrictive deformation, λa, in the basal-plane increases with increasing temperature up to 360 K, but decreases with further increasing temperature.The structural and magnetic properties of Tb2Fe15CF2 compound were investigated by means of X-ray diffraction and magnetization measurements. Tb2Fe15Cr2 compound has a hexagonal Th2Ni17-type structure. Negative thermal expansion was found in Tb2Fe15Cr2 compound from 372 to 452 K by X-ray dilatometry. The coefficient of the average thermal expansion is α^- =-3.14×10^-5 K^-1. The magnetostrictive deformations from 292 to 450 K were calculated. The result showed that the spontaneous volume magnetostrictive deformation ms remains nearly constant with increasing temperature up to 360 K, but decreases with the further increase of temperature. The spontaneous linear magnetostrictive deformation λc along the c axis decreases with increasing temperature. The spontaneous linear magnetostrictive deformation, λa, in the basal-plane increases with increasing temperature up to 360 K, but decreases with further increasing temperature.

关 键 词：condensed matter physics spontaneous magnetostriction X-ray diffraction Tb2Fe15Cr2 compound negative thermal expansion 

分 类 号：O614.341[理学—无机化学] O641.4[理学—化学]