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Gd60Co26Al14大块非晶合金的磁熵变
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中国博士后科学基金(20060390325)


Magnetic Entropy Change of Gd60Co26Al14 Bulk Metallic Glass
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    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571 K发生玻璃化转变,并且出现了两个结晶温度,分别是602 K和642 K。 SQUID测试结果表明:Gd60Co26Al14合金出现两个居里温度,分别是82 K和128 K;合金在外磁场5 T下82 K处的磁熵变达到7 J·

    Abstract:

    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 had a distinct glass transition temperature at 571 K and two crystallization temperatures at 602 K and 642 K, respectively. SQUID measurements indicate that the Gd60Co26Al14 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

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张晓艳,付 浩,祖小涛,余华军. Gd60Co26Al14大块非晶合金的磁熵变[J].稀有金属材料与工程,2009,38(3):431~433.[Zhang Xiaoyan, Fu Hao, Zu Xiaotao, Yu Huajun. Magnetic Entropy Change of Gd60Co26Al14 Bulk Metallic Glass[J]. Rare Metal Materials and Engineering,2009,38(3):431~433.]
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  • 收稿日期:2008-02-12
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