FABRICATION AND CHARACTERIZATION OF SUPERCONDUCTING (BI,PB)-SR-CA-CU-O THICK FILMS ON SR-CA-CU-O SUBSTRATES

Abstract

We have used a new technique to prepare thick films (about 1 µm) of the Bi(Pb)-based hightemperature superconductors. The method begins by standard powder synthesis of the substrateusing strontium and calcium carbonates and copper oxide in the nominal ratio 3:3:4. Pb may beintroduced into the sample by adding lead oxide. The material is fired in air to 975°C for 24 hourswith one intermediate grinding and pressing of pellets. Bi metal is evaporated onto the surface ofthe pellet. Patterning may be easily accomplished using metal masking. The film is then heattreated in air. Subsequent characterization using resistivity, dc magnetization, x-ray diffraction,and scanning electron microscopy has been performed.