The thermal behavior of amorphous hydrated zirconium oxide and its coprecipitates with other oxides was studied.Solid solution with a limit of solubility seems to exist in the amorphous coprecipitates. A relation with the hightemperature solid solution was established. The structure of the amorphous zirconia was studied by X-ray and neutron diffraction; a thin plate model related to the structure of tetragonal zirconia is proposed. Heating the precipitates in an oxygen-free atmosphere produced a black nonstoichiometric oxide and stabilization of the tetragonal form.
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