Abstract
Monoclinic hafnia (HfO2) powders were treated from 400° to 1100°C and at a pressure from 3 to 6GPa. The products were identified by powder XRD. The results indicated that an orthorhombic phase was synthesized at pressures above 4GPa in the temperature range from 400° to 1000°C. Although the monoclinic-orthorhombic transition pressure is almost the same as that of ZrO2, orthorhombic HfO2 is more stable at high temperatures than ZrO2. The Rietveld analysis showed that the orthorhombic HfO2 is isostructural with one of the two orthorhombic ZrO2 (ortho I).
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