Abstract
A finely crystalline tetragonal zirconia powder with a crystal size of less than 40 nm is synthesized from zirconium peroxide. The metastable tetragonal phase of zirconia contains ∼1–3% H2O, is stable up to approximately 500–600°C, and possesses a sufficient stability at room temperature. It is demonstrated that the temperatures of the formation of low-temperature phases and their structure and stability depend on the prehistory of the material and the reactants used. The irreversible phase transformation from metastable forms into stable forms is accompanied by changes in the structure and composition of the phases due to the liberation of impurities (OH–, H2O) stabilizing the metastable phases.
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