MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Magnetic and Structural Properties of MnCoGe with Minimal Fe and Sn Substitution
Masahira OnoueRyota KobayashiYoshifuru MitsuiMasahiko HiroiKohki TakahashiAkihiro KondoKoichi KindoYoshiya UwatokoKeiichi Koyama
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2018 Volume 59 Issue 10 Pages 1645-1650

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Abstract

The magnetic and structural properties of MnCo0.92Fe0.08Ge1−xSnx (x = 0.02, 0.05, and 0.1) were investigated. A first-order magnetic transition was observed, which was accompanied by the martensitic transformation from a hexagonal Ni2In-type to an orthorhombic TiNiSi-type structure in the vicinity of 320 K for x = 0.02 and 170 K for x = 0.05 with thermal hysteresis of approximately 20 K. The magnetization of MnCo0.92Fe0.08Ge0.95Sn0.05 was estimated to be 102 Am2 kg−1 in 5 T at 10 K. High field magnetization curves up to 55 T for MnCo0.92Fe0.08Ge0.95Sn0.05 indicated the field-induced martensitic transformation. Mössbauer spectroscopy experiments revealed that Fe atoms occupied 79%–85% in the Co-site and 21%–15% in the Mn-site.

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© 2018 The Japan Institute of Metals and Materials
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