Fabrication of YBCO films on Ag substrate by TFA-MOD method
来源期刊：中国有色金属学报(英文版)2004年第5期
论文作者：刘敏 董杰 刘丹敏 沈金龙 赵跃 周美玲
文章页码：992 - 995
Key words：YBCO; TFA-MOD; textured Ag； coated conductor
Abstract: Biaxial aligned YBCO films have been successfully deposited on Ag {110}〈110〉 textured polycrystalline substrates by metal-organic decomposition (MOD) method using Trifluoroacetate Salt (TFA). The influence of firing temperature and Ag surface defects on phase purity and texture, surface morphology of YBCO films was studied. Holding temperature at 900 ℃ for 30 min benefits to improve orientation and connectivity of YBCO films. The surface of YBCO films deposited on unpolished Ag substrate has many holes and stripes, which are parallel to the rolling stripe on Ag substrates. To eliminate the rolling stripe on the Ag surface, Ag substrates were polished prior to films deposition. The film grown on polished Ag substrates has a smooth surface and good connectivity of grains without parallel stripes. The YBCO films have an onset of transition around 90K and critical current densities of 15 000 A/cm2.
