Hydrogen absorption of LaFe11.5Si1.5 compound under low hydrogen gas pressure

doi:10.1088/1674-1056/18/10/067

Abstract

Abstract Hydrogen absorptions of LaFe_11.5Si_1.5 compound in 1-atm hydrogen gas at different temperatures are investigated. The hydrogen content in the hydrogenated sample does not increase with the increase of temperature of hydrogen absorption but changes complicatedly. The characteristic of first-order transition in LaFe_11.5Si_1.5 compound is weakened after hydrogen absorption. It leads the peaks of magnetic entropy to become wider and the hysteresis loss to reduce significantly, but relative cooling power (RCP) is not changed considerably.

Keywords: magnetic refrigerant Curie temperature hydrogen absorption temperature magne-tocaloric effect

Received: 30 March 2009
Revised: 04 May 2009
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: Project supported by the National Basic Research Program of China (Grant No 2006CB601101), the National High Technology Research and Development Program of China (Grant No 2007AA03Z440), and the National Natural Science Foundation of China (Grant No 50731

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Fu Bin(傅斌), Long Yi(龙毅), Shi Pu-Ji(史普辑), Ma Tao(马涛), Bao Bo(鲍博), Yan A-Ru(闫阿儒), and Chen Ren-Jie(陈仁杰) Hydrogen absorption of LaFe_11.5Si_1.5 compound under low hydrogen gas pressure 2009 Chin. Phys. B 18 4506

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Hydrogen absorption of LaFe11.5Si1.5 compound under low hydrogen gas pressure

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Hydrogen absorption of LaFe_11.5Si_1.5 compound under low hydrogen gas pressure