物理学报2013，Vol.62Issue(1)：316-322,7.DOI:10.7498/aps.62.016103
组合结构化合物Ho2Ni7-xFex(x=0-3.0)的晶体结构、结构转变和磁性
Structure transformation and magnetisms in Ho2Ni7-xFex compounds
摘要
Abstract
Based on the composite compounds Ho2Ni7-xFe(x=0-0.3), a method of describing the structure transition from rhombohedral to hexagonal is discussed in terms of free electron concentration. The transition is investigated by X-ray powder diffraction and magnetic analysis. The compounds crystallize into the rhombohedral Gd2Co7-type structure for x = 0-0.5 and into the hexagonal Ce2Ni7-type structure for x = 0.5-2.5. The values of lattice parameters a and c of the Ho2Ni7-xFex compounds increase with the addition of Fe, and the saturation magnetization Ms decreases with Fe content increasing at a rate of dMs/dx = -2, manifesting antiparallel alignments of the Fe and Ho moment. The higher the free electron concentration, the stabler the rhombohedral structure is, otherwise the hexagonal structure is stabler, which provides a meaningful parameter to distinguish the two allotropies in composite structure intermetallics.关键词
组合结构/Ho2Ni7-xFex化合物/晶体结构转变/磁性Key words
composite structure/ Ho2Ni7-xFex compounds/ structure transition/ magnetism引用本文复制引用
杨育奇,高庆庆,李冠男..组合结构化合物Ho2Ni7-xFex(x=0-3.0)的晶体结构、结构转变和磁性[J].物理学报,2013,62(1):316-322,7.基金项目
国家自然科学基金(批准号:50631040)资助的课题. （批准号:50631040）
