Phase Stability, Structural and Magnetic Characteristics of Novel R(Co,M) 1:7 Type Intermetallics
We have successfully synthesized novel RCo7-xMx (R=Pr, Nd, Sm, Tb; M=Cu, Si, Hf, Ga, Ag, etc ) intermetallic compounds. RCo7-xMx crystallizes in a hexagonal TbCu7 type structure. According to the structural analysis, the stabilized element M occupies the 2e or the 3g position depending on its electronegativity. RCo7-xMx compounds exhibit ferromagnetic order with high Curie temperature. Uniaxial magnetocrystalline anisotropy is observed in SmCo7-x Mx intermetallics. The magnetism of RCo7-x Mx has been studied using a magnetic valence model, and the calculated results agree well with those of experiment. The structural stability of RCo7-x Mx intermetallics depends on the effective R/(Co,M) atomic radius ratio (RA) and the difference of the electronegativity (XA) between R and (Co,M).
TbCu7 structure uniazial magnetocrystalline anisotropy phase stability magnetic valence model
GUO Yong-quan LI Wei FENG Wei-cun LUO Jun LIANG Jing-kui
Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
国际会议
北京
英文
67-78
2006-08-29（万方平台首次上网日期，不代表论文的发表时间）