Instability of the parent phase in nearly ordered Fe3Pt invar alloys

Takashi Fukuda; Takuya Yamamoto; Masataka Yamamoto; Tomoyuki Kakeshita

doi:10.4028/www.scientific.net/SSP.172-174.79

Instability of the parent phase in nearly ordered Fe₃Pt invar alloys

Takashi Fukuda, Takuya Yamamoto, Masataka Yamamoto, Tomoyuki Kakeshita

ENG - Metallurgy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The martensitic transformation in a nearly ordered Fe₃Pt is weak first order, and the martensite phase shows a large magnetic field-induced strain of several percent. We have investigated the origin of this transformation from its electronic structure. 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.

Original language	English
Title of host publication	Solid-Solid Phase Transformations in Inorganic Materials
Publisher	Trans Tech Publications Ltd
Pages	79-83
Number of pages	5
ISBN (Print)	9783037851432
DOIs	https://doi.org/10.4028/www.scientific.net/SSP.172-174.79
Publication status	Published - 2011

Publication series

Name	Solid State Phenomena
Volume	172-174
ISSN (Print)	1012-0394

Keywords

Ferromagnetic shape memory alloy
Iron-platinum alloy
Martensitic transformation

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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Instability of the parent phase in nearly ordered Fe₃Pt invar alloys. / Fukuda, Takashi; Yamamoto, Takuya; Yamamoto, Masataka; Kakeshita, Tomoyuki.

Solid-Solid Phase Transformations in Inorganic Materials. Trans Tech Publications Ltd, 2011. p. 79-83 (Solid State Phenomena; Vol. 172-174).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AB - The martensitic transformation in a nearly ordered Fe3Pt is weak first order, and the martensite phase shows a large magnetic field-induced strain of several percent. We have investigated the origin of this transformation from its electronic structure. 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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