PROCEDE D'OBTENTION DE PRECURSEURS DE CERAMIQUES SUPRACONDUCTRICES A HAUTE TEMPERATURE CRITIQUE

Process for obtaining precursors for high critical temperature superconductor ceramics, by precipitation of water-insoluble salts, characterised in that it comprises the following stages: - the starting point is a solution of soluble salts where the cations are found in stoichiometric proportions of the desired superconductor phase, - a first complete precipitation is carried out of a first series of cations at a first pH value, - the first precipitate obtained is filtered, washed and the filtrate retained, - a second value is given to the pH of the said filtrate and the residual cations are precipitated, - the second precipitate is filtered, - the first and second precipitates are homogenised, - the product obtained is dried, calcined and crushed.