Atomistic simulation of the structure and curie temperature of R2(CO, Ti)17 (R = Pr, Nd, Sm, Gd, Tb and Dy) and R2(CO, Ti)17Cx

被引：6

作者：

Qian, P ^{[1
]}

Chen, NX

Shen, J

机构：

[1] Beijing Univ Sci & Technol, Inst Appl Phys, Beijing 100083, Peoples R China

[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2005年 / 362卷 / 1-4期

关键词：

interatomic potentials; crystal structure; phase stability; site preference;

D O I：

10.1016/j.physb.2005.02.017

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

An atomistic study is presented on the phase stability, site preference and lattice constants of the Co-rich rare-earth intermetallic compounds R-2(CO, Ti)(17) (R = Pr, Nd, Sm, Gd, Tb and Dy) and R-2(Co, Ti)(17)C-x. The space group remains unchanged upon substitution of Ti for Co in R2(Co, Ti)17 and the calculated structural parameters correspond well to experimental data. The site preference of Ti atoms at Co sites is also evaluated and the order is given as 6c, 18f, 18h and 9d for the rhombohedral Th2Zn17-type structure, and 4f, 12j, 12k and 6g for the hexagonal Th2Ni17-type structure. The effect of interstitial C atoms in R-2(CO, Ti)(17)C-x on the structural properties is also studied. In addition, the decrease of the Curie temperature T. with increasing Ti concentration is explained qualitatively by the exchange-interaction model. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：221 / 230

页数：10

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