The stability field of cotunnite‐type ZrO 2 was determined by both syntheses and measurements of electrical conductivity under pressure using a 6–8 anvil‐type device. The products synthesized below 1000°C were ortho II, whereas those above this temperature were monoclinic when quenched. Abrupt discontinuities in conductivity were observed around 1000°C at 16.5 GPa and around 1050°C at 18 GPa. It is concluded, therefore, that the phase boundary lies a little above about 1000°C at pressures from 15 to 20 GPa with slightly positive slope. The result is consistent with that obtained by synthesis experiment.
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Ohtaka et al. (1990) studied this question.
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