Phases de type alumine β et β″ dans le systeme Na2O  Ga2O3

The study of a Na₂O  Ga₂O₃ system - the contents in Ga₂O₃ being superior to 75 moles % - determines precisely the field of existence of the phase of the β alumina type and it gives evidence of another phase of a β″ alumina type which is close to the composition 5,33 Ga₂O₃  Na₂O.The investigation, through X-rays, of single crystals of the two phases β and β″ makes certain the hexagonal and rhomboedral symetries of the β and β″ alumina type. The β phase presents a high ionic conductivity similar to that of the β alumina.