An Interpretation of Martensitic Transformation in L12-Type Fe3Pt from Its Electronic Structure

Takuya Yamamoto; Masataka Yamamoto; Takashi Fukuda; Tomoyuki Kakeshita; Hisazumi Akai

doi:10.2320/matertrans.M2009400

An Interpretation of Martensitic Transformation in L1₂-Type Fe₃Pt from Its Electronic Structure

Takuya Yamamoto, Masataka Yamamoto, Takashi Fukuda, Tomoyuki Kakeshita, Hisazumi Akai

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Keywords: iron-platinum alloy, martensitic transformation, electronic structure, invar alloy, ferromagnetic shape memory alloy

JOURNAL FREE ACCESS

2010 Volume 51 Issue 5 Pages 896-898

DOI https://doi.org/10.2320/matertrans.M2009400

View "Advance Publication" version (March 17, 2010).

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Abstract

Partly ordered Fe₃Pt is one of ferromagnetic shape memory alloys exhibiting a large magnetic field-induced strain in its martensite phase formed by a second-order-like martensitic transformation from the L1₂-type structure to the so-called FCT martensite (L6₀-type structure). We have investigated the origin of this transformation from their electronic structures calculated in the present study. A characteristic feature in the electronic structure is the existence of a relatively high peak in the density of states of the minority spin band just below the Fermi energy. This peak splits into two peaks by tetragonal distortion, and one of them shifts to lower energy by the distortion, suggesting that the band Jahn-Teller effect is the main cause for the transformation.

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