Gd二元合金纳米固体的磁热熵特性

CHARACTERISTICS IN MAGNETOCALORIC EFFECT AND MAGNETIC ENTROPY OF NANOMETER BINARY GADOLINIUM ALLOYS

考察了Ｇｄ的二元合金系列制备成纳米粉末后具有一些奇异特性：其居里温度降低，比热增大．部分纳米材料的磁热熵效应超过常规晶态材料。

Investigations on magnetocaloric effect and magnetic entropy,Curie temperature and specific heat of nanometer binary gadolinium alloys such as Gd Y,Gd Tb and Gd Zn have been carried out under the conditions of a low magnetic field intensity (1T) and a temperature range within 233-313K. Both Curie temperature and specific heat of the prepared nanometer alloys,compared with the bulk materials,show obvious decrease and increase respectively. The nanometer alloy Gd Y demonstrates an enhanced magnetocaloric effect and magnetic entropy over the same bulk material,which is of importance on researching and developing new materials for magnetic refrigeration. A discussion concerning the influence of nanometer structure on magnetic and heat properties mentioned above is given in detail.