Sm_2Co_(15.24-x)Fe_xCr_(1.76)化合物的结构和磁性

Structural and Magnetic Properties of Sm_2Co_(15.24-x)Fe_xCr_(1.76) Compounds

采用真空电弧熔炼和高温淬火法制备了Sm2Co15.24-xFexCr1.76(x=0.5,1.0,1.5,2.0,2.5)化合物.用X-射线衍射和振动样品磁强计测定了该系列化合物的晶体结构和磁性.X-射线研究结果表明,该系列化合物都具有Th2Zn17型六角晶体结构,空间群属于R-3m.Fe对Co的替代不改变化合物的晶体结构类型.晶格常数a、b和晶胞体积V随着Fe含量的增加而增加,而晶格常数c则几乎没有变化.化合物的居里温度TC随Fe含量的增加而降低.

The Sm2Co15.24-xFexCr1.76（x=0.5,1.0,1.5,2.0,2.5） compounds are prepared by means of arc melting and high-temperature quenching.The structure and magnetic properties of the compounds have been investigated by using X-ray diffraction and Vibriting sample magnetometer.The powder X-ray diffraction patterns show that all samples crystallize in the rhombohedral Th2Zn17-type structure with space group R-3m.Substitution of Fe for Co does not lead to a change in crystal structure.The lattice parameters a,b and V increase monotonically with increasing Fe content,but the lattice parameter c is not changed much.The Curie temperature TC decreases.