Effects of heat treatment on the magnetic phase transition and magnetocaloric properties of Mn 1+δAs 1-xSb x

Hirofumi Wada, Chie Funaba, Tetsuya Asano

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Abstract

We studied effects of heat treatment on the magnetic transition and the magnetocaloric effects (MCEs) of Mn 1-δAs 1-xSb x with x = 0.1 and 0.25. It is found that sintering at an appropriate temperature gives a sharp magnetic transition and hence giant MCEs for Mn 1+δAs 1-xSb x. In the bulk samples slowly cooled from a liquid state, free Sb was precipitated, which gives rise to compositional deviation. Quenching from a liquid state suppresses the precipitation of Sb. Subsequent annealing is effective to improve homogeneity, as a result, the sample undergoes a sharp magnetic transition. The optimum conditions of heat treatments of the present system for a sharp magnetic transition are discussed.

Original languageEnglish
Pages (from-to)486-491
Number of pages6
JournalMaterials Transactions
Volume47
Issue number3
DOIs
Publication statusPublished - Mar 1 2006

All Science Journal Classification (ASJC) codes

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

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