摘要
采用溶胶－凝胶法制得了ＹＢａ２ＣｕａＯ７－δ超细粉和Ａｇ２Ｏ细粉，用特定的烧结方法制各得了ＹＢａ２Ｃｕ３Ｏ７－δ／Ａｇｘ（ｘ＝０～９０％Ｖｏｌ）系列超导块体。研究了含Ａｇ量不同时的ＹＢａ２Ｃｕ３Ｏ７－δ相材料的烧结特性和渗流行为特征，以及对ＹＢ２Ｃｕ３Ｏ７－δ／Ａｇｘ体系的密度、Ｔｃ、Ｊｃ产生的影响．
A series of YBa2Cu3O7-8/Agx(x=0～90%Vol)composite superconductors were prepared by sintering method using YBa2Cu3O7-δ ultrafine powders prepared via Sol-Gel processing and Ag2O fine powders prepared by precipitation.The effect of Ag on Tc of YBa2Cu3O7-δ/Agx samples was not evident, but on Jc and density were obvious,Ag could increase Jc and density in a rang. The normal-state(i.e.nonsuperconducting states of samples at room temperature) resistivity showed a percolation threshold at a Ag volume content of 20%～30%,wherase the superconducting network showed a threshold at a VAg of 70%～80%.
基金
材料复合新技术国家实验室基金
