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In situ Profiles of Oxygen Diffusion in SrTiO 3 : Bulk Behavior and Boundary Effects
Author(s) -
Denk Ingrid,
Noll Frank,
Maier Joachim
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.tb02827.x
Subject(s) - diffusion , grain boundary diffusion coefficient , in situ , materials science , oxygen , grain boundary , dopant , coupling (piping) , surface diffusion , effective diffusion coefficient , diffusion process , chemical physics , analytical chemistry (journal) , mineralogy , chemistry , thermodynamics , composite material , doping , microstructure , knowledge management , innovation diffusion , computer science , magnetic resonance imaging , adsorption , chromatography , radiology , medicine , physics , optoelectronics , organic chemistry
Diffusion profiles have been recorded in situ and evaluated using an optical technique. In this way, bulk diffusion coefficients have been reliably and quantitatively measured. It is shown that the values agree with calculations without using adjustable parameters if the coupling of the diffusing species to internal redox changes of the dopants is accounted for. Measurements on single crystals and on bicrystals with and without crack formation provide worthwhile information on the influence of free relaxed surfaces, freshly produced (crack) surfaces, and grain boundaries on the surface reaction rate and diffusional process. The inward diffusion of oxygen via crack surfaces is characterized by enhanced diffusion coefficients.