THERMAL INVESTIGATIONS OF REACTIVE POWDER MIXTURES AS P~ORS FOR MELT-PROCESSING

DTA and XRD measurements were carried Out with reactive precursors taken from the YO 1.5-BaO--CuO system in order to investigate mechanisms of YBa2Cu307_ x formation. The reactions taking place depend strongly on phase composition, phase purity, powder size and heating rate. Among the examined reactive precursors a mixture of 7Y203+22BaCuO2+10CuO turned out as the most suited for melt-processing.