Preparation of YBa2Cu3Oy thickfilms on Y2BaCuO5:CeO2 substrates by adiffusion process

摘要

High density YBa2Cu3Oy thick films were prepared on Y2BaCuO5(211) substrates with CeO2 additions by a surface diffusion process between Ba 3Cu5Oy composite coating powder and a 211 substrate. It was found that small addition of CeO2 from 0 to 0.5 wt% to the 211 substrate had a strong effect on the reaction between the Ba3Cu5Oy coating layer and the 211 substrate, which led to the crystallization of YBCO thick film grains without impurity phases such as CuO and unreacted Y2O 3 particles along the grain boundaries. As CeO2 additions were increased from 0 to 5 wt%, the density of 211 substrate increased up to 80-90% and the critical temperature and the critical current density of 123 thick films also increased