Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound

doi:10.1088/1009-1963/11/7/318

Abstract

Abstract The LaFe_11.5Si_1.5H_1.3 interstitial compound has been prepared. Its Curie temperature T_C (288 K) has been adjusted to around room temperature, and the maximal magnetic entropy change (|ΔS|～17.0 J·kg^-1·K^-1 at T_C) is larger than that of Gd (|ΔS|～9.8 J·kg^-1·K^-1 at T_C=293 K) by ～73.5% under a magnetic change from 0 to 5 T. The origin of the large magnetic entropy change is attributed to the first-order field-induced itinerant-electron metamagnetic transition. Moreover, the magnetic hysteresis of LaFe_11.5Si_1.5H_1.3 under the increase and decrease of the field is very small, which is favourable to magnetic refrigeration application. The present study suggests that the LaFe_11.5Si_1.5H_1.3 compound is a promising candidate as a room-temperature magnetic refrigerant.

Keywords: NaZn₁₃-type hydride magnetic entropy change room temperature magnetic refrigerant

Received: 04 May 2002
Accepted manuscript online:

PACS:	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	07.20.Mc	(Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)

Fund: Project supported by the State Key Programme of Basic Research of China (973) (Grant No G1998061303) and by the National Natural Science Foundation of China (Grant No 10174094).

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Chen Yuan-Fu (陈远富), Wang Fang (王芳), Shen Bao-Gen (沈保根), Hu Feng-Xia (胡凤霞), Cheng Zhao-Hua (成昭华), Wang Guang-Jun (王光军), Sun Ji-Rong (孙继荣) Large magnetic entropy change near room temperature in the LaFe_11.5Si_1.5H_1.3 interstitial compound 2002 Chinese Physics 11 741

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Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound

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Large magnetic entropy change near room temperature in the LaFe_11.5Si_1.5H_1.3 interstitial compound