Studies of beryllium chromite and other beryllia compounds with R2O3 oxides

Reactions between BeO and R2O3 oxides at high temperatures were studied. Compound formation was observed between BeO and the following oxides: B2O3, Al2O3, Ga2O3, Y2O3, La2O3, and Cr2O3. No reaction was observed with Sc2O3, ln2O3, and Fe2O3. Detailed studies were made of BeO·Cr2O3 which is isostructural with BeO·Al2O3. BeO·Cr2O3 is a semiconductor. Optical and X-ray data are given for all reaction products.