ErFe_(11-x)Cr_xTi化合物结构和居里温度研究  

Study on structure and Curie temperature of ErFe_(11-x)Cr_xTi compounds

作　　者：严达利[1] 竺云[1] 杨娅[1] 冯冬云[1] 李娇[1] 刘野[1] 张学谦[1] 

机构地区：[1]天津师范大学物理与电子信息学院,天津300387

出　　处：《天津师范大学学报（自然科学版）》2010年第1期37-39,75,共4页Journal of Tianjin Normal University：Natural Science Edition

基　　金：天津师范大学青年基金(52LJ15)

摘　　要：通过X射线衍射和磁测量手段研究ErFe11-xCrxTi(x=0,0.5,1.0,1.5,2.0,2.5,3.0)化合物的晶体结构与居里温度.结果表明:ErFe11-xCrxTi化合物均为ThMn12型结构.Cr对Fe的替代导致单胞体积和晶格参数c的单调减小以及晶格参数a的复杂变化,这可能与Cr的择优占位有关;同时,随着Cr替代量x的增加,ErFe11-xCrxTi化合物的居里温度单调下降,这可能是Cr的替代引起3d次晶格中铁磁交换作用削弱和Cr择优占位共同作用的结果.The structure and Curie temperature of ErFe11-xCrxTi（x=0,0.5,1.0,1.5,2.0,2.5,3.0） compounds have been investigated by means of X-ray diffraction and magnetization measurement.The compounds all crystallize in the ThMn12-type structure.The substitution of Cr for Fe leads to monotonic decreases of the unit-cell volume and the lattice constant c.The lattice constant a shows a complicated behavior with increasing x.These may result from the preferential occupation of Cr.Magnetization measurement shows that the Curie temperature TC of ErFe11-xCrxTi compounds decreases monotonously with increasing x.This may be due to the preferential occupation of Cr in the ErFe11-xCrxTi compounds and the decrease of the Fe-Fe interaction which results from the substitution of Cr for Fe.

关 键 词：ErFe11-xCrxTi化合物 晶体结构 居里温度 择优占位 

分 类 号：TG113[金属学及工艺—物理冶金] O482[金属学及工艺—金属学]