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Abstract. The lattice parameters of synthetic diaspore (A10(OH)) and synthetic and natural corundum (A120•) have been measured at simultaneously elevated pressure and temperature up to 7 GPa and 800øC (1000øC for corundum) using a MAX 80 cubic anvil high-pressure apparatus. Several experimental runs were carried out for both minerals, in which the samples were first compressed at room temperature and then heated; NaC! served as an internal standard for pressure calibration. In most runs the samples were mixed with Vaseline or NaC1 to ensure hydrostatic pressure-transmitting conditions. Some runs, mainly at pressures < 4 GPa, were performed without using a pressure medium.

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