STUDY OF AG OXIDE INTERFACE OF BI-2223 SILVER-SHEATHED SUPERCONDUCTING COMPOSITE/

The composition and microstructure of the Ag/Bi-2223 oxide interface i n the silver-sheathed superconducting composite have been analyzed by Auger electron spectroscopy, electron probe microanalysis, x-ray-diffr action analysis, scanning electron microscopy, and energy-dispersive a nalysis x-ray spectroscopy. The results reveal that a diffusion layer exists in the Ag/oxide interface, and the width of the diffusion layer is greater in high-J(c) samples than in low ones. It is also found th at bismuth oxide may vaporize through the silver cladding at high temp erature, and the deficiency of bismuth brings about the formation of n onsuperconducting phase. (C) 1995 American Institute of Physics.