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The effect of pressure to 300 kbar has been measured on the lattice parameters of Al2O3. Corundum has a rhombohedral unit cell and is relatively incompressible (∼9% in 300 kbar). Perhaps the most intersting feature involves an increase of the rhombohedral angle of about 0.5° over this pressure range.
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Hart et al. (1965) studied this question.
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