Table-like magnetocaloric effect and enhanced refrigerant capacity in Eu8Ga16Ge30-EuO composite materials
Table-like magnetocaloric effect and enhanced refrigerant capacity in Eu8Ga16Ge30-EuO composite materials
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DOI：
10.1063/1.3654157
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发表时间：
2011-10-17
影响因子：
4
通讯作者：
Srikanth, Hariharan
中科院分区：
文献类型：
--
作者：
Chaturvedi, Anurag;Stefanoski, Stevce;Srikanth, Hariharan
在由I型笼形物Eu_8 Ga_（16）Ge_（30）和Eu_O组成的多相复合材料中观察到了较大的可逆磁热效应和制冷容量的增强。Eu_8Ga_（16）Ge_（30）在10 K和35 K发生了两次连续的铁磁转变，而EuO在75 K发生了铁磁转变。在Eu_8Ga_（16）Ge_（30）-EuO（40%-60%）复合材料中，在70 K的温度区间内，对于5 T的场变化，获得了794 J/kg的大RC。这是在10 K-100 K温度范围内用于磁制冷的现有磁热材料中曾经达到的最大值。调整Eu 8 Ga 16 Ge 30 EuO的比例，以产生复合材料与表状MCE，理想的埃里克森循环磁制冷。这些Eu 8 Ga 16 Ge 30-EuO复合材料优异的磁热性能使其在液氮温度范围内的主动磁制冷方面具有吸引力。(C)2011年美国物理学会。[doi 10.1063/1.3654157]
A large reversible magnetocaloric effect (MCE) and enhanced refrigerant capacity (RC) were observed in multiphase composite materials composed of type-I clathrate Eu8Ga16Ge30 and EuO. Eu8Ga16Ge30 undergoes two successive ferromagnetic transitions at 10K and 35 K, and EuO exhibits a ferromagnetic transition at 75 K. A large RC of 794 J/kg for a field change of 5 T over a temperature interval of 70K was achieved in the Eu8Ga16Ge30-EuO composite with a 40%-60% weight ratio. This is the largest value ever achieved among existing magnetocaloric materials for magnetic refrigeration in the temperature range 10 K-100 K. Adjusting the Eu8Ga16Ge30 to EuO ratio is shown to produce composites with table-like MCE, desirable for ideal Ericsson-cycle magnetic refrigeration. The excellent magnetocaloric properties of these Eu8Ga16Ge30-EuO composites make them attractive for active magnetic refrigeration in the liquid nitrogen temperature range. (C) 2011 American Institute of Physics. [doi:10.1063/1.3654157]