斜方晶ハフニアの合成とリートベルト法によるX線構造解析

概要

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Monoclinic hafnia (HfO_2) powders were treated from 400°to 1100℃ and at a pressure from 3 to 6 GPa. The products were identified by powder XRD. The results indicated that an orthorhombic phase was synthesized at pressures above 4 GPa in the temperature range from 400° to 1000℃. Although the monoclinic-or-thorhombic transition pressure is almost the same as that of ZrO_2, orthorhombic HfO_2 is more stable at high temperatures than ZrO_2. The Rietveld analysis showed that the orthorhombic HfO_2 is isostructural with one of the two orthorhombic ZrO_2 (ortho I).
1991-09-01