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Equilibration kinetics of TiO 2 single crystal at elevated temperatures
Author(s) -
Nowotny J.,
Bak T.,
Nowotny M. K.,
Sorrell C. C.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541187
Subject(s) - kinetics , crystallite , diffusion , single crystal , chemistry , crystal (programming language) , atmospheric temperature range , crystallography , oxygen , analytical chemistry (journal) , materials science , thermodynamics , physics , organic chemistry , quantum mechanics , computer science , programming language
The equilibration kinetics of single‐crystal TiO 2 were determined in the rapid kinetics regime (within the first 10 h) within narrow ranges of oxygen activities, p (O 2 ), under the conditions of 1198–1323 K and p (O 2 ) = 10 –10 –10 5 Pa. The determined chemical diffusion coefficient, D chem , is observed to exhibit a complex dependence on p (O 2 ). Comparison of D chem for single‐crystal and polycrystalline TiO 2 demonstrates that the grain boundaries have a retarding effect on the transport of defects. The present work represents the first assessment of the effect of nonstoichiometry on well defined D chem for TiO 2 within a wide range of p (O 2 ). (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)