PROCESS FOR THE PRODUCTION OF ALUMINA-BETAŸI1Ÿ.ŸI1Ÿ. AND ALUMINA-BETAŸI1Ÿ.ŸI1Ÿ. OBTAINED BY THIS PROCESS

摘要

The invention relates to a process for the manufacture of beta-alumina by heating aluminum oxide in the presence of Na2 O. /P P According to the invention, a doping metal oxide is dispersed homogeneously chosen from the group comprising Li2 O, MgO, ZnO, CoO, NiO, FeO and mixtures of at least two of these bodies, or a precursor of the doping metal oxide, in a conditioned aluminum oxide (Al2 O3) in quasi-cubic form or a precursor thereof to form a starting mixture; the starting mixture is calcined by heating it to a temperature in the range of 250-1100 degree (s) C in an atmosphere containing oxygen; sodium hydroxide Na 2 O or a precursor thereof is homogeneously dispersed in the calcined starting mixture to form a final mixture; and heating the final mixture to a temperature of at least 1100 degree (s) C in an oxygen-containing atmosphere to produce beta-alumina '' from the final mixture. /P P Application to the manufacture of beta-alumina ''.