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Title: Structure and Phase Transformation in the Giant Magnetostriction Laves-Phase SmFe2

Journal Article · · Inorganic Chemistry
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  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

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities
Grant/Contract Number:
AC02-06CH11357; 21590793; 21231001; 21701008; FRF-TP-17-038A1
OSTI ID:
1422564
Journal Information:
Inorganic Chemistry, Vol. 57, Issue 2; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (1)

Structural, Magnetic, and Magnetoelastic Properties of High Nd-Content Laves Alloys Prepared by Solid-State Synthesis journal May 2019

Figures / Tables (9)


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