Materials Transactions Online

Materials Transactions, Vol.59 No.06 (2018) pp.1005-1008
© 2018 The Japan Institute of Metals and Materials

Synthesis and Thermal Stability of B20-Type TMGe (TM = Mn, Fe and Co) Intermetallic Compounds Prepared by Mechanical Milling

Takanobu Hiroto1, Yeong-Gi So2 and Kaoru Kimura1

1Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
2Department of Materials Science, Akita University, Akita 010-8502, Japan

We propose a new synthesis method of transition-metal monogermanides (TMGe, TM = Mn, Fe, and Co) with a B20-type chiral structure. Arc-melting followed by mechanical milling can be used to produce ∼70-110 Å-sized B20-type structures. Differential scanning calorimetry and heat-treatment tests indicated that the B20-phases are stable below 673 K, 873 K and 773 K for MnGe, FeGe and CoGe, respectively. We also demonstrated that sintering tests are able to yield dense compacts from the FeGe and CoGe B20-phase powders.

[doi:10.2320/matertrans.M2018016]

(Received 2018/01/12; Accepted 2018/03/19; Published 2018/05/25)

Keywords: B20-type transition-metal monogermanide, X-ray diffraction, mechanical milling, spark plasma sintering

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