Control of working temperature of isothermal magnetic entropy change in La0.8Nd0.2(Fe0.88Si0.12)13 by hydrogen absorption for magnetic refrigerants

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

La1-zNdz(Fe0.88Si0.12)13 and their hydrides were investigated to obtain large magnetocaloric effects (MCEs) in a wide temperature range, including room temperature, for applications in magnetic refrigents. Since the magnetization change due to the itinerant-electron metamagentic (IEM) transition for La1-zNdz(Fe0.88Si0.12)13 becomes larger with increasing z, the isothermal magnetic entropy change ΔSm and the relative cooling power (RCP) are enhanced. In addition, the Curie temperatrue TC of La0.8Nd0.2(Fe0.88Si0.12)13 is increased from 193 to 319 K by hydrogen absorption, with the IEM transition. The maximum value of -ΔSm,-ΔSm max, in a magnetic field change of 2 T for La0.8Nd0.2(Fe0.88Si0.12)13H1.1 is about 23 J/kg K at TC=288 K, which is larger than that of 19 J/ kg K at TC=276 K for La(Fe0.88Si0.12)13H1.0. The value of RCP=179 J/kg of the former is also larger than 160 J/ kg of the latter. It is concluded that the partial substitution of Nd improves MCEs in a wide temperautre range, including room temperature.

Original languageEnglish
Pages (from-to)150-154
Number of pages5
JournalJournal of Magnetics
Volume18
Issue number2
DOIs
Publication statusPublished - 2013 Jul 4

Keywords

  • Curie temperature
  • Itinerant-electron metamagnetic transition
  • Latent heat
  • Magnetic refrigeration
  • Relative cooling power

ASJC Scopus subject areas

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

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