Abstract
Abstract A systematic investigation on the influence of the starting materials on the reaction yield in the synthesis of the YBa2Cu3O7−x high Tc superconductor showed that an improvement of the superconducting properties of the samples is obtained if an excess of BaCO3 and CuO in respect to the stoichiometric composition is used and, especially, if BaO2 instead of BaCO3 is employed. The structural and magnetic properties are referred and the valency of Cu is tentatively inferred from the effective magnetic moment, deduced from the thermal behaviour of the inverse paramagnetic susceptibility in the 100 – 600K temperature range.
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