Large magnetocaloric effects in NaZn13-type La(Fe xSi1-x)13 compounds and their hydrides composed of icosahedral clusters

S. Fujieda, Asaya Fujita, K. Fukamichi

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

The magnetocaloric effects (MCEs) in cubic NaZn13-type La(FexSi1-x)13 compounds and their hydrides composed of icosahedral clusters have been investigated because these compounds exhibit the itinerant-electron metamagnetic (IEM) transition just above the Curie temperature TC. The value of TC can be increased continuously up to about 336 K by hydrogen absorption into the La(Fe xSi1-x)13 compounds. Therefore, the values of the isothermal magnetic entropy change ΔSm and the indirectly estimated adiabatic temperature change ΔTad due to the IEM transition become -31 J/kgK and 15.4 K, respectively, in the magnetic field change from 0 to 5T at TC = 287K for the La(Fe0.90Si 0.10)13H1.1 compound. The MCEs in the compounds having the IEM transition are much larger than those in the compounds exhibiting the second-order magnetic transition at TC. The direct measurement of the adiabatic temperature change ΔTad d has confirmed such a large value. Consequently, the La(Fe xSi1-x)13 compounds and their hydrides having the IEM transition are promising as high performance magnetic refrigerants working in a wide temperature range covering room temperature in relatively low magnetic fields.

Original languageEnglish
Pages (from-to)339-346
Number of pages8
JournalScience and Technology of Advanced Materials
Volume4
Issue number4
DOIs
Publication statusPublished - 2003 Jul 1

Keywords

  • Hydride
  • Icosahedral cluster
  • Itinerant-electron metamagnetic transition
  • La(FeSi)
  • Magnetic refrigerants
  • Magnetocaloric effect
  • The Curie temperature

ASJC Scopus subject areas

  • Materials Science(all)

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