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超導方面的應用

來源: 時間:2012-09-08 09:47:44 瀏覽次數:

據報道,用70nm 的銀粉制成的輕燒結體做熱交換材料,可使制冷機工作溫度達到0.01~0.003K,效率較傳統材料高30%。通過研究不同含量納米銀摻雜的( Bi,Pb)2Sr2Ca2Cu3Ox 塊材,發現納米銀摻雜使材料熔點降低
據報道,用70nm 的銀粉制成的輕燒結體做熱交換材料,可使制冷機工作溫度達到0.01~0.003K,效率較傳統材料高30%。通過研究不同含量納米銀摻雜的( Bi,Pb)2Sr2Ca2Cu3Ox 塊材,發現納米銀摻雜使材料熔點降低,加速了高Tc(Tc 指臨界溫度,即從正常狀態到超導態的過程中,電阻消失的溫度)相的形成;納米銀摻雜大大提高了磁通蠕動激活能,其中摻雜15%(質量)Ag 時激活能提高5~6 倍;納米銀摻雜樣品的釘扎能U(H)隨磁場降低比非摻雜樣品要慢,改善了磁場下的傳輸性能;納米銀摻雜使晶間損耗峰向高溫移動20K,改善了晶界弱連接,并大大增強了晶界的渦旋釘扎能力。將納米銀引入超導材料的合成中,大大推動了超導領域的發展。
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