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Metastable Phase Evolution in TiO2-YO3/2-ZrO2

Published online by Cambridge University Press:  01 February 2011

Tobias Schaedler ,
Solome Girma ,
Ashutosh S. Gandhi ,
Sanjay Sampath  and
Carlos G. Levi
Tobias Schaedler
Affiliation:
Materials Department, University of California, Santa Barbara, CA, USA
Solome Girma
Affiliation:
Center for Thermal Spray Research, State University of New York, Stony Brook, NY, USA RISE intern, Materials Department, University of California, Santa Barbara, CA, USA
Ashutosh S. Gandhi
Affiliation:
Materials Department, University of California, Santa Barbara, CA, USA
Sanjay Sampath
Affiliation:
Center for Thermal Spray Research, State University of New York, Stony Brook, NY, USA
Carlos G. Levi
Affiliation:
Materials Department, University of California, Santa Barbara, CA, USA
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Abstract

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 interesting 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 significant composition ranges within the ternary. The study also sheds new light on the correct form of the phase equilibria at 1300°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K3.11
Copyright
Copyright © Materials Research Society 2005

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References

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