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Title: Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe 2

As one class of the most important intermetallic compounds, the binary Laves-phase is well-known for their abundant magnetic properties. Samarium-iron alloy system, SmFe 2, is a prototypical Laves compound that shows strong negative magnetostriction but relatively weak magnetocrystalline anisotropy. SmFe 2 has been identified as a cubic Fd$$ \overline{3}\ $$m structure at room temperature, however, the cubic symmetry does not match the spontaneous magnetization along the [111] cubic direction. Here we studied the crystal structure of SmFe 2 by high-resolution synchrotron X-ray powder diffraction and X-ray total scattering methods. SmFe 2 is found to adopt a centrosymmetric trigonal R$$ \overline{3}\ $$m structure at room temperature, which transforms to an orthorhombic Imma structure at 200 K. This transition is in agreement with the changes of easy magnetization direction from [111] cubic to [110] cubic direction, and is further evidenced by the inflexion of thermal expansion behavior, the sharp decline of the magnetic susceptibility in the FC-ZFC curve, and the anomaly in the specific heat capacity measurement. Lastly, the revised structure and phase transformation of SmFe 2 could be useful to understand the magnetostriction and related physical properties of other RM 2-type pseudo-cubic Laves-phase intermetallic compounds.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1] ;  [3] ;  [4] ;  [3] ; ORCiD logo [1]
  1. Univ. of Science and Technology Beijing, Beijing (China). Dept. of Physical Chemistry
  2. Univ. of Science and Technology Beijing, Beijing (China). State Key Lab. for Advanced Metals and Materials
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
  4. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Cryogenics, Technical Inst. of Physics and Chemistry
Publication Date:
Grant/Contract Number:
AC02-06CH11357; 21590793; 21231001; 21701008; FRF-TP-17-038A1
Type:
Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1422564

Liu, Xiaonan, Lin, Kun, Gao, Qilong, Zhu, He, Li, Qiang, Cao, Yili, Liu, Zhanning, You, Li, Chen, Jun, Ren, Yang, Huang, Rongjin, Lapidus, Saul H., and Xing, Xianran. Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe2. United States: N. p., Web. doi:10.1021/acs.inorgchem.7b02525.
Liu, Xiaonan, Lin, Kun, Gao, Qilong, Zhu, He, Li, Qiang, Cao, Yili, Liu, Zhanning, You, Li, Chen, Jun, Ren, Yang, Huang, Rongjin, Lapidus, Saul H., & Xing, Xianran. Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe2. United States. doi:10.1021/acs.inorgchem.7b02525.
Liu, Xiaonan, Lin, Kun, Gao, Qilong, Zhu, He, Li, Qiang, Cao, Yili, Liu, Zhanning, You, Li, Chen, Jun, Ren, Yang, Huang, Rongjin, Lapidus, Saul H., and Xing, Xianran. 2017. "Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe2". United States. doi:10.1021/acs.inorgchem.7b02525. https://www.osti.gov/servlets/purl/1422564.
@article{osti_1422564,
title = {Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe2},
author = {Liu, Xiaonan and Lin, Kun and Gao, Qilong and Zhu, He and Li, Qiang and Cao, Yili and Liu, Zhanning and You, Li and Chen, Jun and Ren, Yang and Huang, Rongjin and Lapidus, Saul H. and Xing, Xianran},
abstractNote = {As one class of the most important intermetallic compounds, the binary Laves-phase is well-known for their abundant magnetic properties. Samarium-iron alloy system, SmFe2, is a prototypical Laves compound that shows strong negative magnetostriction but relatively weak magnetocrystalline anisotropy. SmFe2 has been identified as a cubic Fd$ \overline{3}\ $m structure at room temperature, however, the cubic symmetry does not match the spontaneous magnetization along the [111]cubic direction. Here we studied the crystal structure of SmFe2 by high-resolution synchrotron X-ray powder diffraction and X-ray total scattering methods. SmFe2 is found to adopt a centrosymmetric trigonal R$ \overline{3}\ $m structure at room temperature, which transforms to an orthorhombic Imma structure at 200 K. This transition is in agreement with the changes of easy magnetization direction from [111]cubic to [110]cubic direction, and is further evidenced by the inflexion of thermal expansion behavior, the sharp decline of the magnetic susceptibility in the FC-ZFC curve, and the anomaly in the specific heat capacity measurement. Lastly, the revised structure and phase transformation of SmFe2 could be useful to understand the magnetostriction and related physical properties of other RM2-type pseudo-cubic Laves-phase intermetallic compounds.},
doi = {10.1021/acs.inorgchem.7b02525},
journal = {Inorganic Chemistry},
number = 2,
volume = 57,
place = {United States},
year = {2017},
month = {12}
}