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Solid-phase grain growth of In$$_{2}$$O$$_{3}$$ at high pressures and temperatures

Saito, Hiroyuki; Utsumi, Wataru; Aoki, Katsutoshi

We determined the pressure-temperature diagram at pressures up to 10 GPa and temperatures of 20-2000 $$^{circ}$$C by in situ X-ray diffraction measurement. The decomposition temperature rose from 1250 to 1700 $$^{circ}$$C as the pressure increased from 2.0 to 4.0 GPa. It remained at about 1700 $$^{circ}$$C at higher pressures. The cubic structure transformed into a rhombohedral corundum structure at 4.0 GPa and 1600 $$^{circ}$$C. The phase boundary had a slightly negative slope and its extrapolation provided an estimated transition pressure of 12 GPa at room temperature. Rapid grain growth was observed near the phase boundary in the rhombohedral region at temperatures around 1000 $$^{circ}$$C still sufficiently below the decomposition temperature. The single crystals of the high-pressure rhombohedral phase were recovered at ambient conditions. The size of the chunk crystals was about 100 $$mu$$m.

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Category:Crystallography

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