METHOD FOR PRODUCTION OF SELENIUM- AND TELLURIUM-CONTAINING CUPRATES OF PREDEFINED COMPOSITION BY MEANS OF OXALATES COPRECIPITATION FROM SOLUTIONS

摘要

The invention relates to methods for production of multielement oxides containing selenium or tellurium as one of the elements, copper as the second element, and one or two alkaline earth metals, in particular, to preparation of furnace charge for production of oxide ceramics using high-temperature sintering method. The objective of the method according to the invention is to increase the quality of the intermediate product - furnace charge homogeneity - for synthesis of cuprates containing oxygen compounds of selenium and tellurium, which is subsequently used to produce high-temperature ceramics, and to decrease furnace charge sintering temperature, and unification of the reaction mixture composition analysis procedure to produce various ceramic materials. The technical result is achieved by using oxalic acid as a precipitant in coprecipitation of cations of copper and alkaline earth metals to produce cuprate synthesis furnace charge; tellurite introduction into the system in the form of freshly powdered tellurous acid; alcaline metal selenate or ammonium introduction into solution of the precipitant - oxalic acid; use of the required concentration ratio range of element compounds and pH range from 3 to 6 for computational modelling; introduction of inoculum into the reaction mixture in the form of a small amount of oxalates mixture; burning ceramic blanks under predefined individual conditions.