H. Comert et al., THE EFFECT OF AG DIFFUSION ON THE CRYSTAL-STRUCTURE AND ELECTRICAL-PROPERTIES OF BI(PB)SRCACUO SUPERCONDUCTORS, Superconductor science and technology, 7(11), 1994, pp. 824-827
X-ray diffraction of Bi(Pb)SrCaCuO compounds, prepared by a convention
al solid-state technique, were measured from 20 degrees C to 500 degre
es C. It was found that diffusion of Ag (600-825 degrees C) in Bi cera
mics stimulates a high degree of grain orientation along the c-axis. I
n Ag-doped samples the lattice parameters a and c are decreased (in co
mparison with the undoped samples) and their dependences on temperatur
e reveal a non-linear character. The critical temperature, determined
from the resistivity measurements, for Ag-doped samples increased to 1
18 K. Ag diffusion at 790 degrees C increases the critical current den
sity more than twice. The influence of low annealing temperature for A
g-doped samples on critical current density was also investigated. The
se results are discussed on the basis of precipitation of Ag solid sol
ution in Bi(Pb)SrCaCuO superconductors.