(中山大学物理系，广州510275)
摘 要: 采用急冷快谇，高能球磨及粉末包套包覆轧制方法制备出Gd-Y，Gd-Zn和Gd-Tb的纳米固体复合磁致冷材料。实验测试结果表明：与大块状材料相比。纳米固体的居里温度明显降低，比热显著增加；Gd-Tb和Gd-Zn合金的磁热熵效应有所降低，但Gd-Y系的磁热熵效应则显著增加。对制备工艺条件及若干影响磁热熵效应的因素进行了较详细的分析。
关键字: 纳米复合材料 磁致冷 稀土 变形
（Department of Physics,Zhoregshan University, Guangzhou 510275）
Abstract:The nanocomposite solids of rare-earth alloys Gd-Y, Gd-Zn and Gd-Tb for magnetic refrigerant have been prepared by means of rapid quenching and ball-milling as well as powder coating-rolling. It turns out that both Curie temperature and specific heat of the prepared nanocomposite solids，compared with the bulk mate-rials,show obviously decrease and increase respectively. The magnetocaloric effect(MCE) of Gd-Y alloy demon-strates an unique raising rather than reducing of both Gd-Tb and Gd-Zn. A discussion concerning the influence of preparing parameters on magnetocaloric effect is given in detail.
Key words: nanocomposite solids magnetic refrigeration rare-earth mechanical deforming
