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Thermal Expansion Anisotropy of Ceria‐Stabilized Tetragonal Zirconia
Author(s) -
Scardi Paolo,
Maggio Rosa Di,
Lutterotti Luca,
Maistrelli Paul
Publication year - 1992
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.1151-2916.1992.tb05512.x
Subject(s) - materials science , thermal expansion , tetragonal crystal system , crystallite , amorphous solid , cubic zirconia , anisotropy , stoichiometry , atmospheric temperature range , analytical chemistry (journal) , mineralogy , crystal structure , composite material , crystallography , metallurgy , ceramic , thermodynamics , chemistry , optics , physics , chromatography
Ceria‐stabilized tetragonal zirconia polycrystals were obtained by thermal treatment of amorphous powder prepared by the sol–gel method. Detailed XRD profile analysis was employed to study microstructural disorder and crystallite size and shape; in particular, no fluctuation of stoichiometry was found, the main cause of disorder being attributable to dislocations. Thermal expansion measurements were carried out by high‐temperature XRD at 294, 473, 673, 873, and 1073 K using silicon as an internal standard. Thermal expansion coefficients are anisotropic and changes in the stabilizer content have little effect on them. A mean value, α a = 10.6 × 10 −6 (K −1 ) and α c = 13.5 × 10 −6 (K −1 ), can be assumed for Zr 1− x Ce x O 2 with x in the range 0.12–0.18.