Premium
Hyperfine Characterization of the Metastable t ″‐Form of the Tetragonal Phase in ZrO 2 –10 mol% Y 2 O 3 Powders Synthesized by Gel Combustion
Author(s) -
Caracoche M. C.,
Martínez J. A.,
Rivas P. C.,
Rodríguez A. M.,
Lamas D. G.,
Lascalea G. E.,
Walsöe de Reca N. E.
Publication year - 2005
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.1551-2916.2005.00231.x
Subject(s) - tetragonal crystal system , nanocrystalline material , metastability , hyperfine structure , materials science , phase (matter) , activation energy , zirconium , diffusion , crystallography , analytical chemistry (journal) , chemistry , thermodynamics , metallurgy , organic chemistry , physics , quantum mechanics
A nanocrystalline ZrO 2 –10 mol% Y 2 O 3 powder synthesized by a nitrate–citrate gel‐combustion process and stabilized in the metastable t ′′‐form of the tetragonal phase has been characterized using mainly the Perturbed Angular Correlations technique. The determined hyperfine interaction allows a clear distinction between the zirconium surroundings in the t ′′‐form and those already known of the other forms of the tetragonal phase. Oxygen vacancies movement is revealed as a slow diffusion involving a very small activation energy. As the powder is heated, a transformation is observed to occur around 560°C, which is consistent with a t ′′‐to‐cubic transition.