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Gd0.95Nb0.05合金磁熱效應(yīng)的研究
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上海市納米中心“納米稀土磁制冷工質(zhì)材料的研究”資助項(xiàng)目（0352nm030）


Study on Magnetocaloric Effect of Gd0.95Nb0.05 Alloys
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    摘要:

    采用X射線衍射技術(shù)、直接磁熱效應(yīng)測(cè)量?jī)x和VSM振動(dòng)樣品磁強(qiáng)計(jì)研究電弧熔鑄和400 ℃，1 h熱處理后低純 Gd0.95Nb0.05合金的磁熱效應(yīng)。結(jié)果表明：適量Nb的加入不改變商業(yè)Gd的居里溫度，但明顯提高了商業(yè)Gd的磁熱效應(yīng)，最大絕熱溫變由3.1 K增加到3.5 K，1.5 T磁場(chǎng)下最大磁熵變?yōu)?.99 J/(kg·K)；Gd0.95Nb0.05合金經(jīng)過(guò)400 ℃，1 h熱處理后，居里溫度提高了2 K，最大絕熱溫變和最大磁熵變有不同程度的增加。與高純Gd相比，商業(yè)原料制備的Gd0.95Nb0.05合金成本低廉，是一種非常實(shí)用的磁制冷工質(zhì)材料。

    Abstract:

    Magnetocaloric effect of low-purity Gd0.95Nb0.05 alloys after arc-casting and 400 oC, 1 h heat treatment was studied by X-ray diffraction technique, direct magnetocaloric effect measuring instrument and vibrating sample magnetometer (VSM). The results show that proper amount of Nb addition doesn’t change the Curie temperature of Gd but obviously improves its magnetocaloric effect. The maximum adiabatic temperature change of Gd0.95Nb0.05 alloys increases to 3.5 K from 3.1 K in 1.2 T magnetic field, higher than that of commercial low-purity Gd. Meanwhile the maximum magnetic entropy of Gd0.95Nb0.05 alloys reaches to 3.99 J/(kg·K) in 1.5 T magnetic field. After 400 oC, 1 h heat treatment, Curie temperature of Gd0.95Nb0.05 alloys increases by 2 K, the maximum adiabatic temperature change increases to 3.6 K in 1.2 T magnetic field, and the maximum magnetic entropy also increases to 4.09 J/(kg·K) in 1.5 T magnetic field. Gd0.95Nb0.05 alloys are a potential candidate of magnetic cooling materials with relatively low cost in commercial field.

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侯雪玲,張 鵬,胡星浩,徐 暉,倪健森,周邦新. Gd0.95Nb0.05合金磁熱效應(yīng)的研究[J].稀有金屬材料與工程,2010,39(1):126~128.[Hou Xueling, Zhang Peng, Hu Xinghao, Xu Hui, Ni Jiansen, Zhou Bangxin. Study on Magnetocaloric Effect of Gd0.95Nb0.05 Alloys[J]. Rare Metal Materials and Engineering,2010,39(1):126~128.]
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  • 收稿日期:2009-01-14
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