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Phase analysis of sintered yttria–zirconia ceramics by x-ray diffraction

Published online by Cambridge University Press:  31 January 2011

A. Paterson  and
R. Stevens
A. Paterson
Affiliation:
National Institute for Materials Research, CSIR, P.O. Box 395, Pretoria, South Africa
R. Stevens
Affiliation:
Department of Ceramics, University of Leeds, Leeds LS2 9JT, England
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Abstract

Determination of the amount of cubic and tetragonal phase in yttria–zirconia using high-angle XRD (x-ray diffraction) has been complicated by problems of resolution and interpretation. The evidence, from electron diffraction studies, for a c→t shear transformation also needs to be taken into account. Two compositions, a 3 and a 5.7 mol % Y2O3−ZrO2, were sintered and thermally treated at different temperatures between 1450°and 1700°C. X-ray diffraction traces revealed the anticipated tetragonal (400) and (004) reflections. The region of the diffraction pattern that was thought to arise from the cubic phase could be best interpreted as a second tetragonal phase t'. The original amount of cubic phase computed from the t' reflections showed good agreement with the phase diagram of Scott. The lattice parameters of the t' phase were determined, and the volume of the tetragonal (t') unit cell was calculated.

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Type
Articles
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Journal of Materials Research , Volume 1 , Issue 2 , April 1986 , pp. 295 - 299
Copyright
Copyright © Materials Research Society 1986

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