An interpretation of martensitic transformation in L12-type Fe3Pt from its electronic structure

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)896-898
Number of pages3
JournalMaterials Transactions
Volume51
Issue number5
DOIs
Publication statusPublished - 2010 May

Keywords

  • Electronic structure
  • Ferromagnetic shape memory alloy
  • Invar alloy
  • Iron-platinum alloy
  • Martensitic transformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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