Microstructure and isothermal magnetic entropy change of La(Fe 0.89Si0.11)13 in a single-phase formation process by annealing

S. Fujieda, K. Fukamichi, S. Suzuki

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

By annealing at 1323 K, the single-phase formation process of La(Fe 0.89Si0.11)13 with a cubic NaZn 13-type structure was investigated. A dendritic microstructure composed of an α-Fe phase with a mean size of about 10 μm and a LaFeSi phase in the as-solidified state is completely changed into the NaZn 13-type single-phase by annealing for 300 h. The growth of the NaZn13-type phase is steep up to an annealing time ta = 100 h, and then becomes sluggish. As a result, the maximum isothermal magnetic entropy change, ΔSmmax, markedly increases with increasing ta up to 100 h in response to the formation of the NaZn13-type phase. In addition, the position of ΔSmmax shifts to higher temperature ranges due to the increase of the Curie temperature TC. Accordingly, thorough annealing for the single-phase formation of La(FexSi 1-x)13 is important for high-performance magnetic refrigerants.

Original languageEnglish
Pages (from-to)196-200
Number of pages5
JournalJournal of Alloys and Compounds
Volume566
DOIs
Publication statusPublished - 2013 Jun 25

Keywords

  • Annealing time
  • Magnetic entropy change
  • Magnetic refrigerant
  • Microstructure
  • Single-phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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