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Reactions between BeO and R 2 O 3 oxides at high temperatures were studied. Compound formation was observed between BeO and the following oxides: B 2 O 3 , Al 2 O 3 , Ga 2 O 3 , Y 2 O 3 , La 2 O 3 , and Cr 2 O 3 . No reaction was observed with Sc 2 O 3 , ln 2 O 3 , and Fe 2 O 3 . Detailed studies were made of BeO·Cr 2 O 3 which is isostructural with BeO·Al 2 O 3 . BeO·Cr 2 O 3 is a semiconductor. Optical and X-ray data are given for all reaction products.

Studies of beryllium chromite and other beryllia compounds with R2O3 oxides