期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 387, 期 -, 页码 159-164出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2015.04.005
关键词
Martensitic structural transition; Metamagnetic transition; MnCoSi; Hexagonal MMX compounds
资金
- National Natural Science Foundation of China [51301195, 51431009]
- National Basic Research Program of China [2012CB619405]
- Beijing Municipal Science & Technology Commission [Z141100004214004]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2013002]
The crystal structures, martensitic structural transitions and magnetic properties of MnCo1-xFexSi (0 <= x <= 0.50) alloys were studied by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and magnetic measurements. In high-temperature paramagnetic state, the alloys undergo a martensitic structural transitions from the Ni2In-type hexagonal parent phase to the TiNiSi-type orthorhombic martensite. Both the martensitic transition temperature (T-M) and Curie temperatures of martensite (T-C(M)) decrease with increasing Fe content. The introduced Fe atoms establish ferromagnetic (FM) coupling within Fe-6Mn atom configurations and destroy the double spiral antiferromagnetic (AFM) coupling in MnCoSi compound, resulting in a magnetic change in the martensite phase from a spiral AFM state to an FM state. For the alloys with x=0.10, 015 and 0.20, a metamagnetic transition was observed in between the two magnetic states. A magnetostructural phase diagram of MnCo1-xFexSi (0 <= x <= 0.50) alloys was proposed. (C) 2015 Elsevier B.V. All rights reserved.
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