Control of magnetocaloric effects by hydrogen absorption into La(Fe xSi1-x)13 magnetic refrigerants

K. Fukamichi, A. Fujita, Shun Fujieda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The magnetocaloric effects (MCE's) due to the itinerant-electron metamagnetic (IEM) transition have been investigated for La(Fe xSi1-x)13Hy compounds. By controlling the hydrogen concentration y, the Curie temperature TC was elevated from around 180 K to room temperature with retaining the IEM transition. A large magnetic entropy change ΔSm was confirmed in x = 0.88 even in relatively small magnetic field and ΔSm is enhanced by increasing Fe concentration up to x = 0.90, consistent with the theoretical predictions. The value of ΔSm is still large enough after increasing TC by hydrogen absorption into La(FexSi 1-x)13Hy compounds. In these compounds and hydrides, the value of the adiabatic temperature change ΔTad estimated from the specific heat data was also confirmed to be large. Furthermore, directly measured adiabatic temperature change ΔT add almost accords with ΔTad, both in magnitude and thermal variation. In addition, La(FexSi 1-x)13Hy, compounds have excellent thermal transport properties. Consequently, the present compounds are one of the promising candidates for magnetic refrigerants working at wide temperature ranges covering room temperature.

Original languageEnglish
Title of host publicationAdvanced Materials for Energy Conversion II
EditorsD. Chandra, R.G. Bautista, L. Schlabach
Pages265-272
Number of pages8
Publication statusPublished - 2004 Jul 13
EventAdvanced Materials for Energy Conversion II - Charlotte, NC., United States
Duration: 2004 Mar 142004 Mar 18

Publication series

NameAdvanced Materials for Energy Conversion II

Other

OtherAdvanced Materials for Energy Conversion II
CountryUnited States
CityCharlotte, NC.
Period04/3/1404/3/18

Keywords

  • Hydrogen Absorption
  • Itinerant-electron metamagnetic transition
  • Magnetocaloric effect

ASJC Scopus subject areas

  • Engineering(all)

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