具有巨磁热效应的GdSiGe系磁致冷新材料的介绍

INTRODUCTION OF GdSiGe ALLOY WITH GIANT MAGNETOCALORIC EFFECT

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，

A giant magnetocaloric effect was discovered in the Gd 5(Si x Ge 1-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 Gd 5Si 2Ge 2 is twice of that of Gd at the same magnetic field, which predict that the engineering application of room temperature magnetic refrigeration is promising.