Phase transition-induced magnetocaloric effects in R2Mo2O7 (R = Er, Dy, Gd and Y) molybdates

Phase transition-induced magnetocaloric effects in R2Mo2O7 (R = Er, Dy, Gd and Y) molybdates
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R2Mo2O7(R = Er、Dy、Gd 和 Y)钼酸盐中相变诱导的磁热效应

DOI:
10.1016/j.matlet.2017.04.007
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发表时间:
2017-07
期刊:
影响因子:
3
通讯作者:
Cheng Zhao-Hua
Cheng Zhao-Hua
中科院分区:
材料科学3区
文献类型:
--
作者:
Wu Yao-Dong;Dong Qiao-Yan;Ma Yue;Ke Ya-Jiao;Su Na;Zhang Xiang-Qun;Wang Li-Chen;Cheng Zhao-Hua

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研究了r2mo2o7 (R= Er, Dy, Gd, Y)的磁性和磁热效应。稀土离子半径对r2mo2o7磁性基态的影响很大。稀土半径较小的er2mo2o7、dy2mo2o7和y2mo2o7在20 K左右表现为自旋玻璃态,而稀土半径较大的g2mo2o7在78 K以下表现为铁磁态,在34 K以下表现为重入自旋玻璃态。磁相变导致磁热效应。特别地,由于在~ 78和~ 10 K的连续两次磁跃迁,Gd 2 Mo 2 O 7在0-10.5 kOe的磁场变化中观察到天然表状-Δ S M和非常大的制冷剂容量(RC)值(94.4 J/kg)。这些显著的磁热特性使g2mo2o7成为低温范围内低场爱立信循环磁制冷的潜在候选者。
We have investigated the magnetic properties and magnetocaloric effects (MCEs) of R 2 Mo 2 O 7 (R= Er, Dy, Gd and Y). Magnetic ground states of R 2 Mo 2 O 7 largely depend on the radius of rare earth ion. Er 2 Mo 2 O 7, Dy 2 Mo 2 O 7 and Y 2 Mo 2 O 7 with small rare earth radius exhibit spin-glass state around 20 K, while Gd 2 Mo 2 O 7 with larger rare earth radius undergoes a ferromagnetic state below 78 K and a reentrant spin-glass behavior below 34 K. Magnetic phase transition leads to magnetocaloric effect. In particular, a natural table-like-Δ S M and a very large refrigerant capacity (RC) value of 94.4 J/kg was observed in a field change of 0–10.5 kOe for Gd 2 Mo 2 O 7 due to two successive magnetic transitions at∼ 78 and∼ 10 K. These notable magnetocaloric properties make the Gd 2 Mo 2 O 7 a potential candidate for low-field Ericsson-cycle magnetic refrigeration in the low temperature range.
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