SUPERCONDUCTING PROPERTIES OF GOLD-DIFFUSION DOPED BIPBSRCACUO

The crystal structure and superconducting properties of the gold-doped BiPbSrCaCuO have been investigated using X-ray diffraction, scanning electron microscope and electrical measurements. Doping of BiPbSrCaCuO was carried out by means of gold diffusion from an evaporated layer o nto pellets at the sintering. It was found that the diffusion doping o f pellets by gold stimulates formation of the Bi (2223) phase, increas es critical temperature and critical current density (from 33 Angstrom cm(-2) for undoped sample to 112 Angstrom cm(-2) for gold-doped BiPbS rCaCuO). Improving of structure and superconducting properties was dis cussed on the base of model related with retarding of the precipitatio n processes under the gold-diffusion doping technique used. Copyright (C) 1996 Elsevier Science Ltd