(四川大學(xué)金屬材料工程系，成都 610065)
*中國(guó)科學(xué)院長(zhǎng)春應(yīng)用化學(xué)研究所，長(zhǎng)春 130022)
(#Department of Physics, University of New Orleans, New Orleans, LA70148-28 40, USA)
摘 要: 較詳細(xì)地介紹了美國(guó)依阿華州立大學(xué)Ames實(shí)驗(yàn)室的一項(xiàng)重大發(fā)現(xiàn)。該實(shí)驗(yàn)室的Pecharsky和Gschneidner兩位科學(xué)家近期發(fā)現(xiàn)具有巨磁熱效應(yīng)的GdSiGe系磁致冷材料。該系合金在30～300 K之間相變點(diǎn)可調(diào)，且其磁熵變?yōu)閷?duì)應(yīng)溫區(qū)已研究出的最好材料的2～10倍；在室溫附近Gd5Si2Ge2的磁熱效應(yīng)是至今所發(fā)現(xiàn)的最好室溫磁致冷材料金屬釓的兩倍，這預(yù)示著可能引起制冷行業(yè)的一場(chǎng)變革。
關(guān)鍵字: 巨磁熱效應(yīng) 磁致冷 磁熵變 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
