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

K. Fukamichi, A. Fujita, Shun Fujieda

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルAdvanced Materials for Energy Conversion II
編集者D. Chandra, R.G. Bautista, L. Schlabach
ページ265-272
ページ数8
出版ステータスPublished - 2004 7月 13
イベントAdvanced Materials for Energy Conversion II - Charlotte, NC., United States
継続期間: 2004 3月 142004 3月 18

出版物シリーズ

名前Advanced Materials for Energy Conversion II

Other

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

ASJC Scopus subject areas

  • 工学(全般)

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