Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound
Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound
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LaFe11.5Si1.5H1.3 间隙化合物在室温附近具有较大的磁熵变
DOI：
10.1088/1009-1963/11/7/318
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发表时间：
2002-07
期刊：
影响因子：
--
通讯作者：
J.R. Sun
中科院分区：
文献类型：
--
作者：
Y.F. Chen;F. Wang;B.G. Shen;F.X. Hu;Z.H. Cheng;G.J. Wang;J.R. Sun
制备了LaFe11.5Si1.5H1.3间隙化合物。它的居里温度TC(288K)已经调整到室温附近，在0~5T的磁场变化下，其最大磁熵变(|S|~17.0J·kg~(-1)K~(-1)在TC时)比Gd(|S|~9.8J·kg~(-1)K~(-1)在TC=293K时)大~73.5%。此外，LaFe11.5Si1.5H1.3在磁场增减作用下的磁滞回线很小，有利于磁制冷的应用。本研究表明，LaFe11.5Si1.5H1.3化合物是一种很有前途的室温磁制冷剂。
The LaFe11.5Si1.5H1.3 interstitial compound has been prepared. Its Curie temperature TC (288 K) has been adjusted to around room temperature and the maximal magnetic entropy change (|?S|~17.0 J?kg-1?K-1 at TC) is larger than that of Gd (|?S|~9.8 J?kg-1?K-1 at TC=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 LaFe11.5Si1.5H1.3 under the increase and decrease of the field is very small, which is favourable to magnetic refrigeration application. The present study suggests that the LaFe11.5Si1.5H1.3 compound is a promising candidate as a room-temperature magnetic refrigerant.