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Gd的純度對(duì)Gd52.5Co18.5Al29非晶合金的玻璃形成能力及磁熱效應(yīng)的影響
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國(guó)家自然科學(xué)基金(50901013)


University of Electronic Science and Technology of China, Chengdu 610054, China
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    研究了稀土金屬Gd的純度對(duì)Gd52.5Co18.5Al29非晶合金的玻璃形成能力和磁熱效應(yīng)的影響。 研究表明Gd的純度從99.94%下降到99.2%，非晶合金的臨界直徑從4 mm減小到3 mm；磁熱效應(yīng)并未隨純度降低而下降，采用高純和低純金屬Gd制備的Gd52.5Co18.5Al29非晶合金的最大磁熵變和相對(duì)制冷量分別為9.4 J·kg-1·K-1, 8.1×102 J·kg-1和9.5 J·kg-1·K-1，8.4×102 J·kg-1。因此，采用商業(yè)低純Gd制備的Gd-基非晶合金適合作為磁致冷候選工質(zhì)

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    Effects of Gd purity on glass-forming ability (GFA) and magnetocaloric effect (MCE) of Gd52.5Co18.5Al29 amorphous alloy were investigated. It is shown that the impurities have an influence on the GFA of Gd52.5Co18.5Al29 glassy alloy rods and the maximum diameters decrease from 4 mm to 3 mm when the purity of Gd decreases from 99.94% to 99.2%. However, no decline of magnetocaloric effect is observed for different-purity alloys and the maximum magnetic entropy changes and relative cooling power of high-purity and low-purity Gd52.5Co18.5Al29 alloys are 9.4 J·kg-1·K-1, 8.1×102 J·kg-1 and 9.5 J·kg-1·K-1, 8.4×102 J·kg-1, respectively. Therefore, it indicates that lower cost Gd52.5Co18.5Al29 alloy prepared by commercial Gd is promising for further application as magnetic refrigerant

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郭茂雙,付 浩,祖小濤. Gd的純度對(duì)Gd52.5Co18.5Al29非晶合金的玻璃形成能力及磁熱效應(yīng)的影響[J].稀有金屬材料與工程,2011,40(7):1243~1246.[Guo Maoshuang, Fu Hao, Zu Xiaotao. University of Electronic Science and Technology of China, Chengdu 610054, China[J]. Rare Metal Materials and Engineering,2011,40(7):1243~1246.]
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  • 收稿日期:2010-07-08
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