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Mass Transport in the Presence of Internal Defect Reactions—Concept of Conservative Ensembles: I, Chemical Diffusion in Pure Compounds
Author(s) -
Maier Joachim
Publication year - 1993
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.1151-2916.1993.tb03743.x
Subject(s) - ionic bonding , diffusion , chemical reaction , ionization , chemical equilibrium , thermodynamics , chemistry , chemical physics , mass transport , redox , statistical physics , physics , ion , inorganic chemistry , engineering physics , biochemistry , organic chemistry
Chemical diffusion is considered for the case in which the diffusing species take part in internal defect chemical reactions giving rise to nonvanishing source terms. As long as local equilibrium is maintained, the concept of conservative ensembles allows one to derive generalized expressions for such cases, e.g., when ionic defect states can change their redox state (variable ionization degrees). In the same way the formulation of boundary conditions is analyzed.