物理学报2012，Vol.61Issue(5)：333-339,7.
Gd基非晶与Gd纳米晶复合结构的磁制冷效应
The magnetocaloric effect of the Gd-based amorphous composite with Gd nanocrystals
摘要
Abstract
The Gd-based amorphous/nanocrystal composite is prepared by controlling the cooling rate and the element ratio. The X-ray diffraction, differential scanning calorimeter and atomic force microscope/magnetic force microscope are used to confirm the composite microstructures from different perspectives. The magnetic test shows the great enhancement of magnetocaloric effect in the metallic glassy composite. The large magnetic refrigerant capacity （RC） up to 103 J. kg-1 is more than double the RC values of the Gd-based bulk metallic glass and pure Gd. The full width at half maximum of the magnetic entropy change （ASm） peak almost spreads over the whole low-temperature range, which is five times wider than that of the pure Gd. The maximum ASm approaches a nearly constant value in a wide temperature span （over 80 K）. The super paramagnetic nanoclusters of the composite increase the magnetic refrigerant capacity greatly. In combination with the low magnetic hysteresis and large resistance, the metallic glass composite may be a potential candidate for the ideal Ericsson-cycle magnetic refrigeration.关键词
非晶/磁制冷效应/纳米晶Key words
amorphous/magnetiocaloric effect/nanocrystals分类
通用工业技术引用本文复制引用
王永田,刘宗德,易军,薛志勇..Gd基非晶与Gd纳米晶复合结构的磁制冷效应[J].物理学报,2012,61(5):333-339,7.基金项目
国家自然科学基金（批准号：51101056,51006034）、国家重点基础研究发展计划（批准号：2011CB710706）、新金属材料国家重点实验室开放基金（批准号：2010Z-02）和苏州市科技计划项目（批准号：SYG201002）资助的课题. （）
