(四川大学金属材料工程系，成都 610065)
*中国科学院长春应用化学研究所，长春 130022)
(#Department of Physics, University of New Orleans, New Orleans, LA70148-28 40, USA)
摘 要: 较详细地介绍了美国依阿华州立大学Ames实验室的一项重大发现。该实验室的Pecharsky和Gschneidner两位科学家近期发现具有巨磁热效应的GdSiGe系磁致冷材料。该系合金在30～300 K之间相变点可调，且其磁熵变为对应温区已研究出的最好材料的2～10倍；在室温附近Gd5Si2Ge2的磁热效应是至今所发现的最好室温磁致冷材料金属钆的两倍，这预示着可能引起制冷行业的一场变革。
关键字: 巨磁热效应 磁致冷 磁熵变 磁致冷材料
（Department of Metallic Materials Engineering, Sichuan University, Chengdu 610065, P. R. China
* Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
# Department of Physics, University of New Orleans, New Orleans, LA70148-2840, U. S. A）
Abstract:A giant magnetocaloric effect was discovered in the Gd5(SixGe1-x)4 (x ≤0.5) alloys by Professor Pecharsky and Gschneidner of Ames Lab. For the temperature range between 30 and 300 K, the alloys exceed the reversible magnetic entropy change for any known magnetic refrigerant material by a factor 2～10. The magnetic entropy change of Gd5Si2Ge2 is twice of that of Gd at the same magnetic field, which predict that the engineering application of room temperature magnetic refrigeration is promising.
Key words: giant magnetocaloric effect; magnetic refrigeration; magnetic entropy change; magnetic refrigerant material
