Anomalous structural transformation and magnetism of Fe-Ga alloys

Masafumi Matsushita, Yasushi Matsushima, Fumihisa Ono

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We have investigated the thermal expansion properties, crystal structures, and magnetism of Fe1-XGaX alloys with 27.5<X<37.5. Fe-Ga alloys with BCC structures can be obtained by quenching from high temperatures, and these alloys exhibit ferromagnetism. As the temperature increases, BCC Fe-Ga alloys undergo crystal structural transformation from the BCC to the FCC structure, accompanied by volume expansion. With a further increase in temperature, these alloys undergo structural transformation from the FCC to a hexagonal phase (D019). The transformation from the FCC to the D019 phase is accompanied by a decrease in volume per atom of the alloys, in spite of an increase in the temperature. The Curie temperature of FCC Fe-Ga alloys is higher than that of BCC Fe-Ga alloys, and D019 show the non-magnetic in present work. Considering from the above-mentioned results, the anomalous volume behavior accompanying the crystal structure transformation can be related to the contribution of magnetism in FCC Fe-Ga alloys. In a previous report, an FCC structure was obtained by carrying out long-time annealing at 550 °C. However, in this study, the FCC structure is obtained from the BCC structure as the temperature increases smoothly at a rate of 5 °C/min. Moreover, the Fe62.5Ga37.5 alloy undergoes a structural transformation from the BCC to an unknown high-temperature phase.

Original languageEnglish
Pages (from-to)1154-1157
Number of pages4
JournalPhysica B: Condensed Matter
Volume405
Issue number4
DOIs
Publication statusPublished - Feb 15 2010

Keywords

  • Alloys
  • Crystal structure
  • Magnetic properties
  • Phase transition
  • Thermal expansion
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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