用柠檬酸盐作螯合剂，用氨水调节溶液的酸度，通过Ｓｏｌ－Ｇｅｌ转变制得了粒径为１００ｎｍ大小的ＹＢａ２Ｃｕ３Ｏ（７－ｘ）超细粉末，对ＹＢａ２Ｃｕ３Ｏ（７－ｘ）在合成反应中溶胶的形成和凝胶聚合过程进行了研究和探讨。Ｓｏｌ－Ｇｅｌ法制得的ＹＢａ２Ｃｕ３Ｏ（７－ｘ）超细粉末在粒度、纯度、烧结特性和超导性能上，均优于固态反应合成方法。

Study on Preparation of YBa_2Cu_3O_(7-x) Ultrafine Powders by Sol-Gel Process Yuan Qihua;Tang Fulong;Lei Jiaheng(Research Institute of Sophisticated Materials, WUT) (Dept. of Material Engineering, WUT)The ultrafine powders of YBa2Cu3O7-x with size of 100urn were synthsizedusing citrate as complex and ammonium hydroxide to adjust pH of solutions by Sol--Gelprocess. The mechanism of Sol--Gel synthetic reaction of YBa2Cu3O7-x phase ultrafine Powders was studied. The Particle size. purity, sintering activity and superconducting properties of YBa2Cu3O7-x Prepared by Sol-Gel method were better than by solid state reaction.: Sol-Gel Process; YBa2 Cu3 O7-x; ultrafine powders