Magnetic Properties and Enhanced Magneto-Caloric Performances by Zn Substitution in the Dy2BaCu1−xZnxO5 (x = 0.25, 0.5, 0.75) Oxides

被引:0
作者
Jiayu Ying
Ningzhou He
Xin Wang
Chenxi Lu
Yikun Zhang
机构
[1] Hangzhou Dianzi University,Key Laboratory of Novel Materials for Sensor of Zhejiang Province &, School of Electronics and Information
[2] Shanghai University,State Key Laboratory of Advanced Special Steels
来源
Journal of Electronic Materials | 2023年 / 52卷
关键词
Dy; BaCu; Zn; O; oxides; magneto-caloric performances; rare earths; magnetic phase transition;
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摘要
Rare earth-based materials with a large magneto-caloric (MC) effect have aroused significant research interest due to their potential application for cryogenic magnetic refrigeration (MR) technology. In this study, the Cu site Zn-substituted Dy2BaCu1−xZnxO5 oxides were synthesized and systematically investigated concerning the structural, magnetic phase transition, and MC properties. All the Dy2BaCu1−xZnxO5 oxides were found to be single-phased with an orthorhombic crystal structure (space group Pnma). With the increase of Zn content in the Dy2BaCu1−xZnxO5 oxides, the magnetic phase transition (MPT) temperature decreases gradually from 12.1 K to 2.1 K and the nature of MPT changes from first-order to second-order type. Moreover, Zn substitution leads to enhanced MC performance. The maximum magnetic entropy changes, temperature-averaged entropy changes with 5 K-lift, and relative cooling powers under the magnetic field change of 0–70 kOe were evaluated to be 8.49 J/kgK, 9.67 J/kgK and 13.23 J/kgK, 8.38 J/kgK, 9.29 J/kgK, and 13.03 J/kgK and 227.43 J/kg, and 283.63 J/kg and 343.04 J/kg for Dy2BaCu0.75Zn0.25O5, Dy2BaCu0.5Zn0.5O5 , and Dy2BaCu0.25Zn0.75O5, respectively. The observed tunable MPT and enhanced MC performances indicate that the present Dy2BaCu1−xZnxO5 oxides have potential for practical cryogenic MR applications.
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页码:4793 / 4800
页数:7
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