以99%级的低纯度金属Gd为原料, 采用真空感应炉制备工艺, 辅以1470 K热处理工艺, 获得了与99.99%级高纯度Gd为原料制备的Gd5Si2Ge2合金相近的磁热效应, 5 T外场下最大磁熵变达17.5 J·kg-1·K-1, 对比电弧熔炼与感应熔炼两种制备方法, 感应熔炼条件下C, N, O杂质含量明显降低, 发现了Gd5Si2Ge2合金巨磁熵变与相结构的本质联系.
参考文献
| [1] | Pecharsky VK;Gschneidner KA .Giant magnetocaloric effect in Gd-5(Si2Ge2)[J].Physical review letters,1997(23):4494-4497. |
| [2] | Gschneidner K A Jr;Pecharsky Vitalij K .Tunable magnetic regenerator alloys with a giant magnetoclaoric effect for magnetic refrigeration from ～20 to ～209 K[J].Applied Physics Letters,1997,70(24):3299. |
| [3] | 龙毅,陈艳平,李丽辉,李春和,万发荣,柳祝红,吴光恒.以低纯度Gd为原料制备Gd5Si1.85Ge2.15合金的磁热效应[J].科学通报,2003(12):1268-1270. |
| [4] | Karl A Gschneidner, Jr,段静芳,龙毅.磁制冷[J].中国稀土学报,2005(04):i-ii. |
| [5] | Gschneidner Jr K A;Pecharsky A O;Pecharsky V K.Production of the giant magnetocaloric effect Gd5(SixGe1-x)4 magnetic refrigerat materials from commercial gadolinium metal[A].Warrendale:The Minerals,Metals and Materials Society,2000:63. |
| [6] | 张铁邦,陈云贵,付浩,滕保华,唐永柏,涂铭旌.低纯Gd制备Gd5Si2Ge2的结构与磁热性能[J].科学通报,2005(18):2043-2045. |
| [7] | 张铁邦,陈云贵,唐永柏,涂铭旌.Gd5Si1.75Ge1.75Sn0.5的结构、磁相变与磁熵变[J].中国稀土学报,2005(04):414-416. |
| [8] | The giant magnetocaloric effect of optimally prepared Gd_(5)Si_(2)Ge_(2)[J].Journal of Applied Physics,2003(8):4722-4728. |
| [9] | Pecharsky A O;Pecharsky V K;Gschneidner K A Jr.[J].Journal of Alloys and Compounds,2000(338):126. |
| [10] | Massalski T B.Binary Alloy Phase Diagrams[M].ASM:Materials Park,()H,1990:1882. |
| [11] | Pecharsky V K;Gschneidner K A Jr .Phase relationships and crystallography in the pseudobinary system Gd5Si4-Gd5Ge4[J].Journal of Alloys and Compounds,1997,260:99. |
| [12] | 陈远富 .室温磁致冷GdSiGe系合金的磁热效应、磁相变及其机制研究[D].四川大学,2001. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%