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Qualitative X-ray diffraction analysis of metastable tetragonal (t ') zirconia

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Author(s)

I R Gibson, J T S Irvine

School/Research organisations

Abstract

The identification and discrimination of cubic (c) and metastable t'-zirconia phases by conventional X-ray diffraction has proved to be a difficult problem because of the crystallographic similarities of the two phases. In this study, the c-phase and t'-phase in biphasic metastable zirconia samples have been successfully distinguished by S-ray diffraction; data mere collected using a high-resolution powder diffractometer with monochromatic radiation and the peak shapes were fitted using a peak-fitting program to distinguish the different phases. From this study, the minimum temperature, T-0, at which the t'-phase can be obtained on cooling rapidly compositions in the range 3-7 mol% Y2O3-ZrO2 to room temperature was estimated as similar to 1425 degreesC. For a constant temperature above 1425 degreesC, the lattice parameters of the t'-phase of 3-7 mol% Y2O3-ZrO2 compositions within the two-phase region of the phase diagram were unaffected by the yttria content; only the amount of t'-phase formed was affected by the yttria content.

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Details

Original languageEnglish
Pages (from-to)615-618
Number of pages4
JournalJournal of the American Ceramic Society
Volume84
Publication statusPublished - Mar 2001

    Research areas

  • CUBIC->TETRAGONAL TRANSFORMATION, MICROSTRUCTURAL EVOLUTION, SYSTEM ZRO2-Y2O3, PHASE-TRANSITION, ALLOYS

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