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Metastable Phase Evolution in TiO2-YO3/2-ZrO2

Author(s):
Tobias Schaedler, Solome Girma, Ashutosh S. Gandhi, Sanjay Sampath, Carlos G. Levi
Materials Department , University of California, Santa Barbara
United States

The metastable-to-equilibrium phase evolution over a wide range of compositions in the TiO2-YO3/2-ZrO2 system was investigated. The competing phases are all derivatives of the fluorite structure and compositions within the fluorite and pyrochlore fields exhibit technologically inter-esting ionic and mixed ionic-electronic conductivity. Powders of various compositions were synthesized by precursor routes, pyrolyzed and subsequently heat-treated in a stepwise manner at progressively higher temperatures to explore the sequence of phase evolution. Extended solid solutions with amorphous, fluorite and ordered pyrochlore structures were produced over signifi-cant composition ranges within the ternary. The study also sheds new light on the correct form of the phase equilibria at 1300°C.

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Track ID:
Paper #: K3.11
DOI: