Giant magnetic entropy change in hydrogenated La(Fe0.88Si0.12)13Hy compounds

Asaya Fujita, Shun Fujieda, Kazuaki Fukamichi, Yoshihiro Yamazaki, Yoshiaki Iijima

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47 Citations (Scopus)

Abstract

A magnetic entropy change ΔSM due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe0.88Si0.12)13 in the magnetic field change from 0 to 5 T. In order to control the Curie temperature while keeping such a large value of ΔSM, hydrogen absorption was carried out. La(Fe0.88Si0.12)13H1.0 with TC = 274 K shows a large ΔSM due to the IEM transition around room temperature. The adiabatic temperature change ΔTad from 0 to 2 T is about 7 K, comparable to that of Gd5(Ge0.5Si0.5)4. By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336 K. It should be noted that the magnitude of ΔSM is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe0.88Si0.12)13Hy compounds are promising magnetic refrigerants working in a wide range of temperature.

Original languageEnglish
Pages (from-to)1202-1204
Number of pages3
JournalMaterials Transactions
Volume43
Issue number5
DOIs
Publication statusPublished - 2002 May

Keywords

  • Adiabatic temperature change
  • Hydrogen absorption
  • Itinerant-electron metamagnetism
  • Magnetic entropy change
  • Magnetic refrigerant

ASJC Scopus subject areas

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

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