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Differentiation between Pseudocubic and Cubic Phases in Y–ZrO 2 Using Rietveld Analysis
Author(s) -
SanchezBajo F.,
Cachadiña Isidro,
Dios Solier Juan,
Guiberteau* Fernando,
Cumbrera Francisco L.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02815.x
Subject(s) - tetragonal crystal system , rietveld refinement , cubic zirconia , confusion , materials science , cubic crystal system , phase (matter) , ceramic , crystallography , crystal structure , mineralogy , chemistry , metallurgy , psychology , organic chemistry , psychoanalysis
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%).