SYNTHESIS AND CHARACTERIZATION OF BA2-XSRXEUSBO6 CERAMIC SUBSTRATES FOR YBCO FILMS

A group of complex perovskites, Ba2-xSrxEuSbO6 (where x = 0, 1 and 2) was synthesized and sintered as single-phase materials for their use a s substrates for YBCO superconductor films. These compounds have a com plex cubic perovskite (A(2)BB'O-6) crystal structure with lattice cons tant in the range 0.85-0.83 nm. The values of dielectric constant and loss factor of Ba2-xSrxEuSbO6 compounds are in the range suitable for their use as substrates for microwave applications of superconductor f ilms. The dielectric constant decreases with increase of strontium con tent. No chemical reaction was observed between YBCO and Ba2-xSrxEuSbO 6 ceramics even when they were mixed in composites of the form 80 vol% YBCO-20 vol% Ba2-xSrxEuSbO6 and processed under severe heat treatment . Addition of up to 20 vol% Ba2-xSrxEuSbO6 to YBCO showed no detriment al effect on superconducting properties of YBCO. The YBCO thick films developed on sintered specimens by dip coating were textured and showe d (00/) orientation with T-c(0) = 92 K.