宽温域<strong>Mn</strong>基反钙钛矿复合磁制冷材料的设计和制备

doi:10.11901/1005.3093.2021.237

材料研究学报

2022, Vol. 36

Issue (2): 133-139 DOI: 10.11901/1005.3093.2021.237

研究论文

本期目录 | 过刊浏览

宽温域Mn基反钙钛矿复合磁制冷材料的设计和制备

梁鹏利, 闫君(

), 魏诗杰, 蒋丛稷, 陈云琳

北京交通大学理学院微纳材料及应用研究所北京 100044

Design and Preparation of Mn-based Antipervoskite Magnetic Refrigerant Composites with Wide Temperature Range

LIANG Pengli, YAN Jun(

), WEI Shijie, JIANG Congji, CHEN Yunlin

Institute of Applied Micro-Nano Materials, School of Science, Beijing Jiaotong University, Beijing 100044, China

引用本文:

梁鹏利, 闫君, 魏诗杰, 蒋丛稷, 陈云琳. 宽温域Mn基反钙钛矿复合磁制冷材料的设计和制备[J]. 材料研究学报, 2022, 36(2): 133-139.
Pengli LIANG, Jun YAN, Shijie WEI, Congji JIANG, Yunlin CHEN. Design and Preparation of Mn-based Antipervoskite Magnetic Refrigerant Composites with Wide Temperature Range[J]. Chinese Journal of Materials Research, 2022, 36(2): 133-139.

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摘要:

采用固相合成法高温烧结Mn₃SnC和Mn₃CuN两种化合物制备出相变温区连续变化的Mn₃Sn_1-_x Cu _x C_1-_x N _x 系列化合物，再将不同相变温区的Mn₃Sn_1-_x Cu _x C_1-_x N _x 化合物进行物理混合制备出反钙钛矿复合磁制冷材料。这种磁制冷材料在室温附近具有“平台”状的磁熵变-温度曲线，与Mn₃SnC单体材料相比其磁制冷温区由275~285 K扩展为220~300 K，磁熵变-温度曲线的半高宽从5 K增大到70 K，但是其磁熵变值大幅降低。推导了这种磁制冷材料的最大磁熵变值与磁熵变曲线半高宽和单体材料相对制冷量之间的定量关系式，解释了扩展制冷温区与提高磁熵变值之间的竞争。此定量公式不仅可用于研究反钙钛矿材料体系，对研究其它复合磁制冷材料体系也有重要的参考价值。本文首次根据单体材料的热流曲线提出了新复合磁制冷材料的计算和预测方法，可极大地简化磁制冷复合材料的设计。

关键词 ：复合材料, 磁卡效应, 反钙钛矿, 相变

Abstract：

Polycrystalline compounds of Mn₃Sn_1-_x Cu _x C_1-_x N _x were synthesized by solid-state reaction with Mn₃SnC and Mn₃CuN as raw materials. The phase transition temperature of Mn₃Sn_1-_x Cu _x C_1-_x N _x continuously changes with the variation of the Mn₃SnC content. The compounds present platform-shaped magnetic entropy-temperature curves around room temperature. Compared with Mn₃SnC, the magnetic cooling temperature range of the compounds changed from 275~285 K to 220~300 K, and the full width at half maximum of magnetic entropy change curve increased from 5 K to 70 K. However, the magnetic entropy of the compounds decreased significantly. The relationship among the maximum of magnetic entropy change, the half-height width of the magnetic entropy change curve for the compounds and the relative cooling power of the monomer materials was acquired. The competition between expanding the cooling temperature range and increasing the magnetic entropy change can be well understood. This quantitative formula is of significance in the field not only for the antiperovskite materials, but also for other magnetic refrigerant composites. In this work a new calculation and prediction method of magnetic refrigerant composites were proposed based on the heat flow curve of monomer material, and it could greatly simplify the design process of composite materials.

Key words： composite magnetocaloric effect antipervoskite phase transition

收稿日期: 2021-04-15

ZTFLH:

O469

基金资助:国家自然科学基金(51802014);中央高校基本科研业务费专项资金(2019JBM068)

作者简介: 梁鹏利，女，1995年，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.237 或 https://www.cjmr.org/CN/Y2022/V36/I2/133

图1 Mn3CuN、Mn3SnC和Mn3Sn1-x Cu x C1-x N x (x=0.125，0.111，0.100，0.091)的室温XRD谱

图2 复合样品和复合组分在(200)峰处的室温XRD谱

图3 Mn3Sn1-x Cu x C1-xN x (x=0.125，0.111，0.100，0.091)和Mn3SnC的热流曲线、熵变与温度曲线以及复合材料(实线和虚线分别表示实验测量和理论计算值)的热流曲线和熵变与温度的关系

图4 Mn3SnC、Mn3Sn1-x Cu x C1-xN x (x=0.125, 0.111, 0.100, 0.091)和复合材料在500 Oe磁场中的磁化强度与温度(M-T)关系

图5 复合材料的循环等温磁化(M-H)曲线和磁熵变与温度((-?SM )-T)的关系曲线

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