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Shock Induced Emission from Sapphire in High-Pressure Phase of Rh2O3 (II) Structure

A distinct optical emission from the Rh2O3 (II) structural sapphire is observed under shock compression of 125, 132, and 143 GPa. The emission intensity continuously increases with the thickness of shocked sapphire. The colour temperature is determined to be about 4000 K, which is obviously smaller than the reported value of the alpha phase alumina at the pressures below 80 GPa. The present results suggest that the structural transformation will cause an obvious change of optical property in sapphire.