Low-Temperature Phase Relationships in the System ZrO2-TiO2

Authors

  • ANNA E. McHALE,

    1. National Bureau of Standards, U.S. Department of Commerce, Gaithersburg, Maryland 20899
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    • Member, the American Ceramic Society.

    • Current address: New York State College of Ceramics, Alfred University, Alfred, NY 14802.

  • ROBERT S. ROTH

    1. National Bureau of Standards, U.S. Department of Commerce, Gaithersburg, Maryland 20899
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    • Member, the American Ceramic Society.


  • Support tor A. E. M. provided by an NBS/NRC postdoctoral fellowship.

Abstract

The phase relationships in the system ZrO2-TiO2 near the compound ZrTiO4 have been clarified through an experimental study involving the characterization of both single-crystal and powder specimens, the latter prepared through conventional solid-state reaction and also by low-temperature co-precipitation methods. Zr1+xTi1-xO4 (1/10 >x>-1/6), having the α-PbO2-type structure, is found to transform on cooling between ∼1100° and ∼1150°C. Below this temperature there is an unusual, continuous phase transition leading to the formation of the stable low-temperature phase ZrTi2O6. Low-level doping with Y2O3 was found to enhance apparent cation ordering in intermediate compositions in the temperature range just below the phase transition.

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