Abstract
X-ray diffraction of Bi(Pb)SrCaCuO compounds, prepared by a conventional solid-state technique, were measured from 20 degrees C to 500 degrees C. It was found that diffusion of Ag (600-825 degrees C) in Bi ceramics stimulates a high degree of grain orientation along the c-axis. In Ag-doped samples the lattice parameters a and c are decreased (in comparison with the undoped samples) and their dependences on temperature reveal a non-linear character. The critical temperature, determined from the resistivity measurements, for Ag-doped samples increased to 118 K. Ag diffusion at 790 degrees C increases the critical current density more than twice. The influence of low annealing temperature for Ag-doped samples on critical current density was also investigated. These results are discussed on the basis of precipitation of Ag solid solution in Bi(Pb)SrCaCuO superconductors.
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