Excellent magnetocaloric properties in RE(2)Cu(2)Cd (RE = Dy and Tm) compounds and its composite materials.
Excellent magnetocaloric properties in RE(2)Cu(2)Cd (RE = Dy and Tm) compounds and its composite materials.
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RE2Cu2Cd (RE = Dy 和 Tm) 化合物及其复合材料具有优异的磁热性能
DOI：
10.1038/srep34192
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发表时间：
2016-09-26
影响因子：
4.6
通讯作者：
Wilde G
中科院分区：
文献类型：
--
作者：
Zhang Y;Yang Y;Xu X;Geng S;Hou L;Li X;Ren Z;Wilde G
研究了RE2Cu2Cd(RE=Dy和Tm)三元金属间化合物及其复合材料的磁性和磁热效应。Dy2Cu2Cd和Tm2Cu2Cd的居里温度分别为TC~48.5和15K，两种化合物都发生了顺磁到铁磁的转变，产生了较大的可逆MCE。Dy2Cu2Cd化合物在16K附近还观察到一个额外的磁相变。在0-70kOE的磁场范围内，Dy2Cu2Cd和Tm2Cu2Cd的最大磁熵变(−ΔSMmax)分别为17.0J/kgK和20.8J/kgK。在Dy2Cu2Cd-Tm2Cu2Cd复合材料中，在10-70K的宽温度范围内获得了台状的MCE，并提高了制冷能力。在0~50kOe的磁场范围内，Rc分别比单独的化合物Dy2Cu2Cd和Tm2Cu2Cd提高32%和153%。RE2Cu2Cd(RE=Dy和Tm)及其复合材料具有优异的磁致伸缩性能，有望在低温磁制冷中得到有效应用。
The magnetic properties and magnetocaloric effect (MCE) of ternary intermetallic RE2Cu2Cd (RE = Dy and Tm) compounds and its composite materials have been investigated in detail. Both compounds undergo a paramagnetic to ferromagnetic transition at its own Curie temperatures of TC ~ 48.5 and 15 K for Dy2Cu2Cd and Tm2Cu2Cd, respectively, giving rise to the large reversible MCE. An additionally magnetic transition can be observed around 16 K for Dy2Cu2Cd compound. The maximum values of magnetic entropy change (−ΔSMmax) are estimated to be 17.0 and 20.8 J/kg K for Dy2Cu2Cd and Tm2Cu2Cd, for a magnetic field change of 0–70 kOe, respectively. A table-like MCE in a wide temperature range of 10–70 K and enhanced refrigerant capacity (RC) are achieved in the Dy2Cu2Cd - Tm2Cu2Cd composite materials. For a magnetic field change of 0–50 kOe, the maximum improvements of RC reach 32% and 153%, in comparison with that of individual compound Dy2Cu2Cd and Tm2Cu2Cd. The excellent MCE properties suggest the RE2Cu2Cd (RE = Dy and Tm) and its composite materials could be expected to have effective applications for low temperature magnetic refrigeration.