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Interdiffusion Studies of the System Fe x O‐MgO
Author(s) -
RIGBY E. BERTRAND,
CUTLER IVAN B.
Publication year - 1965
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.1151-2916.1965.tb11806.x
Subject(s) - vacancy defect , ion , magnesium , enthalpy , chemistry , solid solution , analytical chemistry (journal) , diffusion , entropy of activation , inorganic chemistry , thermodynamics , crystallography , kinetics , reaction rate constant , chromatography , organic chemistry , physics , quantum mechanics
The solid‐state reaction between Fe,O and MgO is best described as counterdiffusion of the magnesium and iron ions through a relatively rigid oxygen ion lattice of the rock salt structure. A relation between a mutual diffusion coefficient and a controlled cation vacancy concentration was determined by an analysis of the concentration‐penetration curve of the Fe,O‐MgO solid solution. The diffusion coefficient increased approximately exponentially with a linear increase of the cation vacancy concentration. This may be represented by a linear increase of the entropy of activation with vacancy concentration. The enthalpy of activation for the diffusion reaction, 47.5 kcal per mole, remained independent of vacancy concentration.