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Differentiation between Pseudocubic and Cubic Phases in Y–ZrO2 Using Rietveld Analysis

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Abstract:

The precise microstructural characterization of the yttriapartially stabilized zirconia (Y-PSZ) system by means of X-ray diffractometry (XRD) experiments faces a serious challenge: the discrimination beween the cubic, c, and pseudocubic, t', phases. We show how the confusion between the two phases goes beyond a simple qualitative problem, because the relative abundances for all the present polymorphs can be substantially modified. This is particularly true for the amount of transformable tetragonal phase, which is of paramount importance for the design of zirconia-based tough ceramics. Similarly, we show that a conclusive discrimination between c and I' phases is possible on the basis of XRD experiments by a careful application of the Rietveld method and by emphasizing some subtle details around the angular domain close to the {200} planes. The procedure is applied to samples of Y-PSZ (4.7 mol%).

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02815.x

Affiliations: Departamento de Físicia, Facultad de Ciencias Universidad de Extremadura, 06071 Badajoz, Spain

Publication date: January 1, 1997

bsc/jace/1997/00000080/00000001/art00031
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