Structure and magnetic characteristics of novel SmCo-based hard magnetic alloys

被引：55
作者：
Guo, Y. Q. [1 ]
Li, W. [1 ]
Luo, J. [2 ]
Feng, W. C. [1 ]
Liang, J. K. [2 ]
机构：
[1] Cent Iron & Steel Res Inst, Inst Funct Mat, Beijing 100081, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 303卷 / 02期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
SmCo7-xMx Intermetallic compounds; Uniaxial magnetocrystalline anisotropy; Calculation of saturation moment; Structural stability;
D O I：
10.1016/j.jmmm.2006.01.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have successfully synthesized novel SmCo7-xMx (M = 3d transition metal or normal metal) intermetallic compounds. The structural and magnetic properties of SmCo7-xMx compounds have been investigated using powder X-ray diffraction and magnetic measurements. SmCo7-xMx crystallizes in a hexagonal TbCu7 structure with space group of P6/mmm, and Z = 1. According to the structural refinement, the M dopants occupy the 2e and 3 g crystal positions based on their electronegativities. SmCo7-xMx compounds are strongly ferromagnetic and exhibit uniaxial magnetocrystalline anisotropy. The saturation moment has been calculated with a magnetic valence model, the calculated results agree well with those of experiment. The structural stability of SmCo7-xMx compounds is related to the effective Sm/(Co,M) atomic radius ratio (R-A) and the difference in electronegativity (X-A) between Sm and (Co, M). According to our calculation, the SmCo 1:7-type structure can be stabilized in range from 1.08(5) to 1.12(9) for R-A and -1.04(4) to -0.94(4) for X-A. (C) 2006 Elsevier B. V. All rights reserved.
引用
收藏
页码：E367 / E370
页数：4
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