Gd_(60)Co_(26)Al_(14)大块非晶合金的磁熵变  

Magnetic Entropy Change of Gd_(60)Co_(26)Al_(14) Bulk Metallic Glass

作　　者：张晓艳[1] 付浩[1] 祖小涛[1] 余华军[1] 

机构地区：[1]电子科技大学,四川成都610054

出　　处：《稀有金属材料与工程》2009年第3期431-433,共3页Rare Metal Materials and Engineering

基　　金：中国博士后科学基金(20060390325)

摘　　要：利用铜模吸铸法制备了Gd60Co26Al14非晶合金。采用示差扫描量热法(DSC),X射线衍射(XRD)和超导量子磁强计(SQUID)研究了其结构与磁热性能。XRD分析表明:铸态Gd60Co26Al14合金是完全的非晶结构;DSC测试显示Gd60Co26Al14合金在加热过程中在571K发生玻璃化转变,并且出现了两个结晶温度,分别是602K和642K。SQUID测试结果表明:Gd60Co26Al14合金出现两个居里温度,分别是82K和128K;合金在外磁场5T下82K处的磁熵变达到7J·(kg·K-1)。Bulk metallic glassy （BMG） alloys Gd60Co26Al14 were prepared by a copper-mold casting method. Their structure and thermomagnetic properties were studied by DSC, XRD and SQUID. XRD analysis shows that the as-cast Gd60Co26Al14 cylinder was fully amorphous structure in 3 mm diameter. The DSC reveals that Gd60Co26Al14 BMG bad a distinct glass transition temperature at 571 K and two crystallization temperatures at 602 K and 642 K, respectively. SQUID measurements indicate that theGd60Co26Al14 BMG had two Curie temperatures occurring at 82 K and 128 K, respectively. The entropy change was 7 J.（kg.K）^-1 at 82 K in 5 T magnetic field.

关 键 词：大块非晶 居里温度 等温磁熵变 磁致冷材料 

分 类 号：TG139.8[一般工业技术—材料科学与工程]