Studies in Lithium Oxide Systems: II, Li ₂ O Al ₂ O ₃ –Al ₂ O ₃

Abstract

Solid‐state reactions between Li 2 O and Al 2 O 3 were studied in the region between Li 2 O.Al 2 O 3 and Al 2 O 3 . The compound Li 2 O Al 2 O 3 melts at 1610°± 15°C. and undergoes a rapid reversible inversion between 1200° and 1300°C. Vaporization of Li 2 O from compositions in the system proceeds at an appreciable rate at 1400°C, as shown by fluorescence. Lithium spinel, Li 2 O ‐5Al 2 O 3 , was the only other compound observed. The effect of Li 2 O on the sintering of alumina was investigated.