Influence of homogenization of microstructual composition on hydrogen absorption into La(FexSi1-x)13 magnetic refrigerants

S. Fujieda, Asaya Fujita, K. Fukamichi, S. Suzuki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The Curie temperature TC of La(Fe0.89Si 0.11)13 in inhomogeneous and homogeneous (single phase) states is controlled by heat treatment and hydrogen absorption. The magnetization change at TC around room temperature of the inhomogeneous specimens composed of α-Fe, LaFeSi, and La(Fe xSi1-x)13 phases becomes sluggish after hydrogen absorption, because TC in the specimens has a distribution accompanied by some inhomogeneity of the hydrogen content. As a result, the magnitude of the isothermal magnetic entropy change Δ Sm due to the itinerant-electron metamagnetic transition of these specimens is decreased by hydrogen absorption. On the other hand, the magnitude of Δ S m after hydrogen absorption into the single-phase specimen is almost the same as that before hydrogen absorption. Consequently, the compositional homogenization in La(FexSi1-x)13 is necessary to obtain large magnetocaloric effects around room temperature.

Original languageEnglish
Article number6027627
Pages (from-to)2459-2462
Number of pages4
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Homogenization
  • hydrogen absorption
  • itinerant-electron metamagnetic transition
  • magnetocaloric effects (MCEs)
  • microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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