A study of $YBa_2Cu_3O_{7-\delta}$ Thick Films by a Diffusion Process Between $Y-2BaCuO_5$ Substrate and ($BaCuO_2+CuO$)

$Y-2BaCuO_5$기판과 ($BaCuO_2+CuO$) 분말의 확산법에 의한 $YBa_2Cu_3O_{7-\delta}$ 후막 연구

The formation of the $YBa_2Cu_30_{7_\delta}$(Y123) thick films has been investigated by a surface diffusion Imcess between $3BaCu0_2$+2CuO composite coating powder and a $Y_2BaCuO_5$(Y211). This reaction has been studied in the temperature of $930^{\circ}C$ and $940^{\circ}C$ for 2h to 10h in an oxygen atmosphere. The Y211 substrates becomes covered by co-precipitation of Y123 grains and CuO inclusions. X-ray diflractotnctn. revealed that the lager consisted of an orthorhombic crystal structure. The maximum Jc of $400A/\textrm{cm}^2$ is abtained when the specimen was heat-treated at $930^{\circ}C$ for 6h on the Y211 substrate.