Reduction of magnetic hysteresis loss in La0.5Pr0.5Fe11.4Si1.6Hx hydrides with large magnetocaloric effects

Reduction of magnetic hysteresis loss in La0.5Pr0.5Fe11.4Si1.6Hx hydrides with large magnetocaloric effects
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具有大磁热效应的La0.5Pr0.5Fe11.4Si1.6Hx氢化物减少磁滞损耗

DOI:
10.1063/1.3374635
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发表时间:
2010-06
影响因子:
3.2
通讯作者:
--
中科院分区:
物理与天体物理3区
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--
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研究了氢化La0.5Pr0.5Fe11.4Si1.6Hx(x=0,0.9,1.6)化合物的磁性和磁热效应。结果表明,通过将氢含量从0调整到1.6,居里温度T_c可以在189~317K之间调节。值得注意的是,由于氢化后巡回电子-电子变磁转变的减弱,热滞和磁滞均显著减小,同时保留了较大的磁熵变。当x从0增加到1.6时,Tc处的最大磁滞损耗从17.8 J/kg减小到2.3J/kg。对于x=0、0.9和1.6时的样品,−ΔS在TC时的最大值分别为26.3J/kg K、24.1 J/kg和22.1J/kg,当磁场变化为0~5T时,有效制冷量分别为463J/kg、366J/kg和351J/kg。La0.5Pr0.5Fe11.4Si1.6Hx氢化物具有较大的可逆MCE和较小的磁滞回值,表明La0.5Pr0.5Fe11.4Si1.6Hx氢化物在室温附近有可能成为一种候选的磁性制冷剂。
Magnetic properties and magnetocaloric effects (MCEs) have been investigated in hydrogenated La0.5Pr0.5Fe11.4Si1.6Hx (x=0, 0.9, and 1.6) compounds. It is found that the Curie temperature TC can be tuned from 189 to 317 K by adjusting hydrogen content from 0 to 1.6. It is attractive that both thermal and magnetic hysteresis are remarkably reduced because of the weakness of the itinerant-electron metamagnetic transition after hydrogenation, while the large magnetic entropy change is retained. The maximal hysteresis loss at TC decreases from 17.8 to 2.3 J/kg as x increases from 0 to 1.6. For the samples with x=0, 0.9, and 1.6, the maximal values of −ΔS are 26.3, 24.1, and 22.1 J/kg K at TC, with efficient refrigeration capacities of 463, 366, and 351 J/kg for a field change of 0–5 T, respectively. Large reversible MCE and small hysteresis with considerable value of refrigeration capacity indicate the potentiality of La0.5Pr0.5Fe11.4Si1.6Hx hydrides as a candidate magnetic refrigerant around room temperature.
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
发表时间: 2002-07
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影响因子: 64.8
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