Atomic occupation and role of Cr atoms in Cr-doped Ni43Co7Mn39Sn11 magnetic shape memory alloys
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作者
Wang, Songwang; Yang, Ruoou; Lu, Guangduo; Yi, Lizhi; Liu, Min; Xu, Yunli; Pan, Liqing
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刊物名称
JOURNAL OF ALLOYS AND COMPOUNDS
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年、卷、文献号
2022, 929, 0925-8388
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关键词
Wang, Songwang; Yang, Ruoou; Lu, Guangduo; Yi, Lizhi; Liu, Min; Xu, Yunli; Pan, Liqing
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摘要
The atomic occupation, magnetic properties and the relationship between them of Ni43Co7Mn39-xCrxSn11(x = 0, 0.4, 0.6, 0.8, 1.0, 1.2 at%) alloys have been systematically investigated. To elucidate the oc-cupancy of Cr atoms, extended X-ray absorption fine structure (EXAFS) is performed and Cr K-edge EXAFS analysis determines that Cr atoms occupy Y site of the Ni43Co7Mn38Cr1Sn11 sample. Ferromagnetic re-sonance shows the evolution of the microscopic magnetic properties of the magnetic atoms with the in-crease of Cr doping content, which further confirms the Y-site occupation of Cr atoms. The experimental results show that in the Ni43Co7Mn39Sn11 system, Cr doping replaces Mn at the Y site, breaking the sym-metry of the crystal field of Mn atoms at the Z site, reducing the atomic displacement potential. The doping of Cr atoms significantly enhances the driving force of its magnetic field-induced martensitic transforma-tion. (c) 2022 Elsevier B.V. All rights reserved.
