EFFECT OF PROCESS PARAMETERS IN THE DECOMPOSITION OF A CRYOCHEMICAL SALT PRODUCT OF THE Bi-Pb-Sr-Ca-Cu-O SYSTEM ON THE STRUCTURE AND PROPERTIES OF A CERAMICS

摘要

A study was made of the effect of the temperature and time of decomposition of a salt product on the phase composition, microstructure, and magnetic susceptibility of a Bi - Pb - Sr - Ca - Cu - O superconducting ceramics. Holding the powder at 570 deg C slows the formation of the high-temperature phases, while increasing the decomposition temperature to 840 deg C and increasing the time of decomposition at 815 deg C have the same effect on the concentrations of the phases Ca_2PbO_4, CuO, and (CaSr)_2CuO_3. The data obtained on magnetic susceptibility, together with the results of microscopic and x-ray spectral studies, made it possible to evaluate the effect of the morphology of the grains and the grain boundaries on the superconductivity of the sintered specimens.