【摘要】 用阶梯烧结,后退火和随炉慢冷制备出了 Tc～110KBi—Sr—Ca—Cu—O 超导体。组份和热处理最佳化研究表明,原子比接近 Bi∶Sr∶Ca=1∶1∶1有限组份的样品,容易获得高 Tc 相;当组份偏离这个比例(如 Bi∶Sr∶Ca=2∶2∶1)时,只有与烧结条件无关的低 Tc 相形成。在865—880℃之间阶梯烧结后接着退火处理,可使低 Tc 相减少,高Tc 相增加。当烧结温度低于850℃时,也只有低 Tc 相形成。更多还原

【Abstract】 The Bi-Sr-Ca-Cu-O Superconducors with the Tc-110K have been prepared by the step sintering, post annealing and furnace cooling. The optimization study of composition and heat treatment has shown that the high-Tc phase can be easily obtained for the sample with a limited composition near atomic of Bi : Sr : Ca = 1 : 1 : 1. As the composition deviates from the ratio 1:1: 1, only the low-Tc phase forms irrespective of sintering conditions. Be means of the step sitering at 865-880℃ and following post annealing, the low-Tc phase can be m-inimized and the high-Tc phase can be increased. When the sintering temperature is lower than 850℃, only the low-Tc phase forms.更多还原