Abstract
Shock compression experiments on polycrystalline Sc2O3‐type structure (C‐type) Sc2O3 were carried to a pressure of 90 GPa by a gun method. Hugoniot elastic limits (HEL) were measured to be 6.8–9.9 GPa. A phase transition was observed at 40.9±1.3 GPa. The estimated zero pressure volume of the high pressure phase was 0.233 cm3/g, 11.5% denser than the C‐type. This phase transition pressure was consistent with a tendency that phase transition to a La2O3‐type structure (A‐type) was linearly increasing with reducing cationic and anionic radius ratios in other rare earth sesquioxides, revealing that the high pressure phase observed was the A‐type.
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