کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1600338 1515873 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electronic structure and possible martensitic transformation in Mn2NiGe and Ni2MnGe
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Electronic structure and possible martensitic transformation in Mn2NiGe and Ni2MnGe
چکیده انگلیسی


• Possibility of martensitic transformation in Ge-doped NiMn alloys is tested.
• Electronic structure and magnetism of Mn2NiGe and Ni2MnGe have been investigated.
• New FSMAs may be synthesized in Mn2NiGe or Heusler alloy with similar compositions.

The electronic structure and magnetism of Heusler alloys Mn2NiGe and Ni2MnGe have been studied by first-principles calculations. The possible non-modulated tetragonal martensitic transformation in them has been predicted. For both Mn2NiGe and Ni2MnGe, the tetragonal martensitic phase is lower in energy compared with the cubic austenitic phase. In Ni2MnGe, the martensitic transformation follows the conservation of volume. But in Mn2NiGe, a small contraction of the martensitic cell volume is predicted. The energy difference ΔE between the martensitic and austenitic phase is −8 meV/cell in Ni2MnGe and −80 meV/cell in Mn2NiGe, so it is more likely to observe martensitic transformation in Mn2NiGe or Heusler alloys with similar compositions. Ni2MnGe is found to be a ferromagnet, while Mn2NiGe is a ferrimagnet in which the Mn spin moments are in antiparallel coupling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 38, July 2013, Pages 139–143
نویسندگان
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