Neutron Diffraction Study of Unusual Magnetic Behaviors in the Ho2Fe11Al6 Intermetallic Compound
Neutron Diffraction Study of Unusual Magnetic Behaviors in the Ho2Fe11Al6 Intermetallic Compound
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Ho2Fe11Al6 金属间化合物异常磁行为的中子衍射研究
DOI：
10.1021/acs.inorgchem.9b02051
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发表时间：
2019-10-21
影响因子：
4.6
通讯作者：
Xing, Xianran
中科院分区：
文献类型：
--
作者：
Cao, Yili;Lin, Kun;Xing, Xianran
结构-性质关系的知识在磁性材料的开发中是基本而重要的。本文报道了高Al取代Fe将晶体结构从六方Ho2Fe17化合物转变为菱形Ho2Fe11Al6化合物。有趣的是，与前者相比，后者在86和220 K左右表现出不同寻常的磁化演化。对Ho2Fe11Al6化合物的详细结构分析和磁性能的综合研究表明，Ho2Fe11Al6化合物在5 ~ 430 K范围内具有稳定的菱面体结构（R (3) / barm），优先占据Al原子，在居里温度以下具有Ho和Fe的磁矩在基面上反平行的铁磁结构。矩的温度依赖性结果表明，Ho和Fe亚晶格的矩变化率不同，在86 K和220 K左右会产生不寻常的磁化演化，然后在280 K以上转向顺磁。本工作为Ho2Fe11Al6化合物提供了清晰的结构和磁化信息，有助于指导磁性材料的未来发展。
Knowledge of structure-property relationships is fundamental but significant in the exploitation of magnetic materials. Here we report that the high Al substitution for Fe transformed the crystal structure from a hexagonal Ho2Fe17 compound to a rhombohedral Ho2Fe11Al6 compound. Intriguingly, the latter shows unusual evolution of magnetization around 86 and 220 K compared with the former. Integrated investigations of the detailed structure analysis and magnetic performance on the Ho2Fe11Al6 compound demonstrate that the Ho2Fe11Al6 compound possesses a stable rhombohedral structure (R (3) over barm) from 5 to 430 K with preferred occupation of Al atoms and ferrimagnetic structure in which the magnetic moments of Ho and Fe lie antiparallel in the basal plane below the Curie temperature. The results of the temperature dependence of moments reveal that the disparate rates of change of the moments for Ho and Fe sublattices give rise to unusual evolution of magnetization around 86 and 220 K and then turn to paramagnetic above 280 K. This work provides clear structure and magnetization information on the Ho2Fe11Al6 compound, which may be beneficial to guiding the future development of magnetic materials.