CRYSTALLIZATION OF VITREOUS BSCCO PRECURS ORS

The glassy precursors were fabricated by quenching the melted material s with copper plates. In the case of heating the properties of the que nched samples were changed, because as a result of solid-state reactio ns, formation of cuprate occurs. The amorphous samples were annealed i n air and transformed to the crystalline state. This process can be se en by DTA and electric resistivity behaviours. The microscopic observa tion of the polished surfaces show the growth of the superconducting p hase Bi2Sr2CaCu2O8+x (for composition Bi-2212) and Bi2Sr2CaCu2O8+x wit h Bi2Sr2Ca2Cu3O10+x (for composition Bi-2223 and Bi-2234), respectivel y.