Abstract
Oxynitrides in the ZrO2-rich part of the systems Ca–Zr–O–N and Mg–Zr–O–N have been prepared by nitridation of the corresponding oxides in nitrogen atmosphere at temperatures between 1400 and 2000°C. A thermodynamic model of the nitridation is presented. The crystal structures of the resulting oxynitride phases are derived from the fluorite-type structure of the cubic high temperature phase of ZrO2. The structure of the β′ phase in the Mg–Zr–O–N system has been investigated using X-ray powder methods. Its trigonally distorted fluorite-type structure (ordered anion vacancies) can be described by an arrangement of Bevan clusters (A7X12units) andA7X14units. At ∼975°C, a transition into a cubic fluorite-type phase with randomly distributed vacancies has been observed.
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