Premium
Room‐Temperature Degradation of t ‐Zr(Pr)O 2 in an Aqueous Suspension Revealed by Perturbed Angular Correlations
Author(s) -
Caracoche María C.,
Martinez Jorge A.,
Rivas Patricia C.,
Andreola Fernanda,
Bondioli Federica,
Ferrari Anna Maria,
Manfredini Tiziano
Publication year - 2008
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.1551-2916.2007.02074.x
Subject(s) - monoclinic crystal system , tetragonal crystal system , suspension (topology) , diffusion , aqueous solution , aqueous suspension , phase (matter) , analytical chemistry (journal) , degradation (telecommunications) , materials science , ion , cubic zirconia , chemistry , mineralogy , crystallography , thermodynamics , ceramic , composite material , crystal structure , chromatography , physics , organic chemistry , telecommunications , mathematics , homotopy , pure mathematics , computer science
This paper deals with the phase stability of an aqueous suspension of tetragonal Zr 0.9 Pr 0.1 O 2 (20 wt%/vol%) at room temperature as a function of the aging time. The suspension is investigated in situ using the highly localized Perturbed Angular Correlations technique. The results indicate that an almost fully reversible degradation process toward monoclinic zirconia takes place through a first‐order reaction of rate constant k =0.7 day −1 . Two successive diffusion mechanisms are observed that are interpreted as OH − ions' migration in the grain surface and then, as proton defects' diffusion into the bulk.