Ericsson-like giant magnetocaloric effect in GdCrO4-ErCrO4 composite oxides near liquid hydrogen temperature

Ericsson-like giant magnetocaloric effect in GdCrO4-ErCrO4 composite oxides near liquid hydrogen temperature
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GdCrO4-ErCrO4复合氧化物在液氢温度附近的类Ericsson巨磁热效应

DOI:
10.1016/j.matlet.2015.09.070
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发表时间:
2015-12
期刊:
影响因子:
3
通讯作者:
Cheng, Z. H.
Cheng, Z. H.
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang, L. C.;Shen, B. G.;Sun, J. R.;Cheng, Z. H.

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本文研究了RCrO_4(R=Gd和Er)氧化物的磁性和磁热性能。结果表明,GdCrO 4和ErCrO 4在居里温度分别为22.0 K和14.9 K时发生了从铁磁到顺磁的二级磁转变.磁场变化为0-5 T时,GdCrO 4和ErCrO 4的最大磁熵变(ΔSM)分别达到22.8 J kg− 1 K − 1和20.5 J kg− 1 K − 1。来自R3+和Cr 5+离子的集体磁性贡献导致大的ΔSM。在相同的磁场变化下,由质量比为1:1的GdCrO 4和ErCrO 4组成的复合材料在16.0 ~ 22.0K温度范围内的Δ SM约为19.5J kg− 1 K − 1,制冷量(RC)可达117 J kg− 1。由于液氢温度(20.3K)在此范围内,GdCrO 4-ErCrO 4复合材料具有较大的可逆磁热效应,较高的RC值以及较低的成本,使其成为一种潜在的储氢磁制冷材料。
In this paper, magnetic and magnetocaloric properties of RCrO4(R=Gd and Er) oxides have been investigated. It is found that GdCrO4and ErCrO4exhibit a second-order magnetic transition from ferromagnetic to paramagnetic states at their Curie temperatures of 22.0 K and 14.9 K, respectively. The maximal magnetic entropy change (ΔSM) for a field variation of 0–5 T have reached 22.8 J kg−1K−1for GdCrO4and 20.5 J kg−1K−1for ErCrO4. The collective magnetic contributions from R3+and Cr5+ions lead to the large ΔSM. For the same field variation, table-like ΔSMof ~19.5 J kg−1K−1and a large refrigerant capacity (RC) of 117 J kg−1have been achieved for the composite material formed by GdCrO4and ErCrO4with the mass ratio of 1:1 from 16.0 K to 22.0 K. Since the liquid hydrogen temperature (20.3 K) locates within this range, large reversible magnetocaloric effect, highRCas well as the low cost make GdCrO4–ErCrO4composite material a potential candidate for magnetic refrigerant for the storage of liquid hydrogen.
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