The tetragonal‐to‐cubic phase transition of rapidly quenched 12 mol% ErO1.5─ZrO2 was investigated in situ using high‐temperature X‐ray diffraction. Rapid quenching of the melt yielded a small oxygen ion displacement and a small tetragonality, axial ratio c/a. Although the tetragonality of the as‐quenched specimen increased with temperature up to about 1000°C, it became independent of temperature on cooling to room temperature from about 1000°C and reheating up to 1000°C. The tetragonality decreased continuously with temperature above 1000°C and became unity at about 1400°C. The atomic coordination z for the oxygen ion, which expresses the displacement from its ideal site in the fluorite‐type structure, increased with temperature and became 1/4 at about 1400°C. The tetragonality increased with annealing time through a thermal activation, which could explain the compositional dependence of the tetragonality in rapidly quenched ZrO2─RO1.5 samples (R = rare earths).
|Number of pages||8|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1993 Jan 1|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry