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Gd60Co26Al14大塊非晶合金的磁熵變
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中國(guó)博士后科學(xué)基金（20060390325）


Magnetic Entropy Change of Gd60Co26Al14 Bulk Metallic Glass
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    摘要:

    利用銅模吸鑄法制備了Gd60Co26Al14非晶合金。采用示差掃描量熱法（DSC），X射線(xiàn)衍射（XRD）和超導(dǎo)量子磁強(qiáng)計(jì)（SQUID）研究了其結(jié)構(gòu)與磁熱性能。XRD分析表明：鑄態(tài)Gd60Co26Al14合金是完全的非晶結(jié)構(gòu)；DSC測(cè)試顯示Gd60Co26Al14合金在加熱過(guò)程中在571 K發(fā)生玻璃化轉(zhuǎn)變，并且出現(xiàn)了兩個(gè)結(jié)晶溫度，分別是602 K和642 K。 SQUID測(cè)試結(jié)果表明：Gd60Co26Al14合金出現(xiàn)兩個(gè)居里溫度，分別是82 K和128 K；合金在外磁場(chǎng)5 T下82 K處的磁熵變達(dá)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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張曉艷,付 浩,祖小濤,余華軍. Gd60Co26Al14大塊非晶合金的磁熵變[J].稀有金屬材料與工程,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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