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Study on Gd-Si-Ge Alloys Using Domestic Gd 总被引:3,自引:1,他引:2
To evaluate the possibility of using Gd-Si-Ge alloys in magnetic refrigerators, samples of Gd-Si-Ge alloys were made of domestic Gd. The magnetocaloric effect of samples was estimated by magnetic entropy change (-△ASm) calculated from M-H curves according to Maxwell relation. The first order phase transformation was destroyed due to the impuritiesin the commercial Gd, so that no giant magnetocaloric effect was found. The samples made of purified Gd exhibit first order phase transformation, and the -△Sm is basically consistent with the published data of Ames laboratory, USA. This work proves that Gd-Si-Ge alloys made of domestic Gd can be utilized in magnetic refrigerators. 相似文献
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针对以往铁电制冷方式的不足提出了一种基于热开关的铁电制冷模型的新结构并进行了相关数值计算。此结构中片状铁电材料与片状热开关紧密平行排列,构成模型的基本结构。热开关分‘开’和‘关’两种可控状态,其开状态的热导率远高于关状态的热导率。系统工作时铁电材料片按奇偶位置分别加电场与去电场,每半周期交换。模拟计算涉及铁电材料单元数以及系统不同温跨下的制冷系统性能,模拟计算结果表明,在固定铁电材料单元数或系统温跨时,对于制冷效率以及制冷功率均存在最佳工作点,并且此工作点随系统温跨或铁电材料单元数变化呈规律性变化。 相似文献
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