Abstract: The melting temperature and critical transition temperature T, of YBa2Cu3O7-δ with deferent content additives of PbO and BaPbO3 were studied. When PbO was doped in YBa2Cu3O7-δ the melting temperature of YBa2Cu3O7-δ was reduced, however its superconductivity was weakened. From the XRD pattern of the sintered mixture of YBa2Cu3O7-δ and PbO, it was known that there was a reaction between YBa2Cu3O7-δ and PbO, and the product was BaPbO Hence different contents of BaPbO3 (10mass, 20massand 30mass) were added in YBa2Cu3O7-δ It was proved that there were no reactions between YBa2Cu3O7-δ and BaPbO3.And the superconductivity of the mixtures was much better than that of the samples with PbO additive.

Key words: YBa2Cu3O7-δ PbO additive, melting temperature, superconductivity