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Activation Enthalpy for Diffusion in Glass
Author(s) -
McElfresh DavidK.,
Howitt Dvid G.
Publication year - 1986
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.1151-2916.1986.tb07347.x
Subject(s) - enthalpy , diffusion equation , diffusion , standard enthalpy change of formation , strain (injury) , activation energy , thermodynamics , heat equation , materials science , strain energy , atom (system on chip) , physics , chemistry , computer science , quantum mechanics , engineering , medicine , metric (unit) , operations management , finite element method , embedded system
Foe nearly three decades people have employed an equation derived by Frenkel to describe the strain energy of an atom diffusing in a glass. This equation describes the strain energy to enlarge a spherical cavity and predicts physically unreasonable results. An alternative equation for a circularly symmetric enlargement is presented which is a more representative geometry and does not lead to these inconsistencies.