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Interdiffusion in the System SrF 2 ‐BaF 2
Author(s) -
SCHEIDECKER R. W.,
BERARD M. F.
Publication year - 1976
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.1151-2916.1976.tb09511.x
Subject(s) - microprobe , diffusion , chemistry , dilution , alkaline earth metal , analytical chemistry (journal) , electron microprobe , tracer , extrapolation , impurity , mineralogy , activation energy , ion , alkali metal , thermodynamics , physics , mathematical analysis , mathematics , organic chemistry , chromatography , nuclear physics
A microprobe study of interdiffusion between 1033° and 1238°C in the system SrF 2 ‐BaF 2 was conducted using single crystals. The interdiffusion coefficient, D , generally decreased with increasing SrF 2 concentration, but the composition dependence of D decreased with decreasing temperature. Extrapolation of D values to infinite dilution allowed the impurity cation self‐ diffusion coefficients:The values for D Sr in BaF 2 are in excellent agreement with tracer results. An analysis of the activation energies for cations diffusing in alkaline‐earth fluorides shows a direct correlation between constriction ratio and migration energy for a single ion diffusing in different fluorides. An apparent anomaly arises when attempting to correlate migration energy with structural information for different cations diffusing in the same fluoride.