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Dislocation Dependence of Cationic Diffusion in SrTiO 3
Author(s) -
RHODES W. H.,
KINGERY W. D.
Publication year - 1966
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.1151-2916.1966.tb13155.x
Subject(s) - dislocation , strontium titanate , diffusion , lattice diffusion coefficient , effective diffusion coefficient , ion , materials science , dislocation creep , crystallography , condensed matter physics , chemistry , thermodynamics , composite material , nanotechnology , thin film , physics , medicine , organic chemistry , radiology , magnetic resonance imaging
Cation self‐diffusion was measured in single‐crystal strontium titanate. Nonhomogeneous diffusion kinetics were observed and were interpreted by the Fisher model. The composite diffusion coefficient, P , of the Fisher model is shown to have a dependence on dislocation density, ρ, in single crystals at 1875°C given by:for strontium, andfor titanium. It has previously been shown that oxygen ions have enhanced diffusivities in dislocation pipes; therefore, in SrTiO 3 all ions exhibit enhanced dislocation diffusion. Based on an assumed maximum value for lattice diffusion, the temperature dependence of strontium dislocation pipe diffusion is given by:where h 2 is the dislocation core area.