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Acta Metall Sin >

2024 , Vol. 60 >Issue 8: 1150 - 1154

DOI: https://doi.org/10.11900/0412.1961.2024.00008

Research paper

Magnetic Structure and Abnormal Thermal Expansion of Trigonal Cr5Te8

  • REN Weijun ,
  • AN Meng ,
  • GAO Fei ,
  • LUO Xiaohua ,
  • LI Bing ,
  • ZHANG Zhidong ,
  • WANG Chin-Wei
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  • 1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    3 Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia
REN Weijun, professor, Tel: (024)23971856, E-mail: wjren@imr.ac.cn

Received date: 2024-01-12

  Revised date: 2024-01-31

  Online published: 2024-04-19

Supported by

National Key Research and Development Program of China(2020YFA0406002);National Natural Science Foundation of China(52071323)

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Abstract

Many binary Cr-Te compounds can be regarded as formed due to varying degrees of ordered vacancies of metal Cr atoms in Cr-Te with the NiAs structure. Among them, Cr5Te8 shows two structures: trigonal and monoclinic. This study determined that Cr5Te8 grown using the self-flux method shows a trigonal P3¯m1 crystal structure with lattice constants a = 0.3900 nm and c = 0.5986 nm, as elucidated through the Rietveld refinement of powder X-ray and neutron diffraction patterns. Neutron powder diffraction experiments reveal its collinear ferromagnetic compound, with Cr magnetic moments oriented along the c axis. In addition, it exhibits low negative thermal expansion along the a direction and normal thermal expansion along the c direction. Within the temperature range of 3.3-300 K, using the lowest temperature of 3.3 K as a reference, the average thermal expansion coefficient of Cr5Te8 is -10.7 × 10-6 and 52.4 × 10-6 K-1 in the a and c directions, respectively. Cr5Te8 crystals oriented along the [101], [302], and [201] directions show near-zero thermal expansion and thus have wide application prospects. The abnormal thermal expansion of Cr5Te8 is apparently unrelated to its magnetic order but may be related to the Cr vacancies in the crystal lattice.

Key words： neutron powder diffraction; negative thermal expansion; magnetic structure

Cite this article

REN Weijun , AN Meng , GAO Fei , LUO Xiaohua , LI Bing , ZHANG Zhidong , WANG Chin-Wei . Magnetic Structure and Abnormal Thermal Expansion of Trigonal Cr5Te8[J]. Acta Metall Sin, 2024 , 60(8) : 1150 -1154 . DOI: 10.11900/0412.1961.2024.00008

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