INFLUENCE OF RESIDUAL PHASES ON THE PROPERTIES OF YBA2CU3O7-X

The partial melting in YBaCuO incompletely synthesised powders occurri ng at temperatures below the peritectic decomposition of the 123 (i. e . YBa2Cu3O7-x) compounds is related to the presence of residual phases . Our results showed that the final ceramic has got a high porosity, w hich is independent on the temperature of sintering, the double grain size distribution and two transition temperatures up to the sintering temperature 940-degrees-C as a consequence of a higher content of the residual carbonate. The sintering at higher temperature improved super conducting properties of our ceramics. This progress is connected with cracking of large grain ceramic and with the decomposition of carbona te BaCO3.