Joining of Semiconductive BaTiO₃ with YBCO Thick Film and their Interfaces

Abstract

Joinings of semiconductive BaTiO₃ with Y₁Ba₂Cu₃O_7-x were studied by hot press and by sintering in the case of thick film (about 18-30μm) of Y₁Ba₂Cu₃O_7-x. The conditions of hot press were 4 kg/cm² and kept for 420 minutes at 1173K in oxygen atmosphere, and three kinds of parameters on temperature and time were investigated for the thick films on BaTiO₃. The electrical resistivities were evaluated on the systems of the film/BaTiO₃ and the conditions of 1173K and 420 minute-keeping gave a superconductivity. Furthermore, the interfaces between the semiconductor and the film of superconductor were also investigated by an EPMA to show a diffusion of Cu from Y₁Ba₂Cu₃O_7-x for both methods of the joining. There seemed to be existing non-superconducting compounds, however a superconductive film on the semiconductive BaTiO₃ can be formed by optimizing the joining conditions.