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Composition Dependence of 63 Ni Diffusion in Single‐Crystal NiO‐MgO Solid Solutions
Author(s) -
WEI G. C. T.,
WUENSCH B. J.
Publication year - 1973
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.1151-2916.1973.tb12416.x
Subject(s) - non blocking i/o , solid solution , diffusion , materials science , single crystal , analytical chemistry (journal) , crystal (programming language) , chemistry , crystallography , thermodynamics , metallurgy , chromatography , catalysis , biochemistry , physics , computer science , programming language
Diffusion coefficients were determined for 63 Ni diffused into single‐crystal NiO‐MgO solid solutions for 16.2 h at 1303°C. The solid solutions ranged in composition from 0 to 67.9 at.% NiO and were prepared by prior interdiffusion between NiO‐MgO powder compacts and single‐crystal MgO at conditions (10 days at 1800°C) selected to provide concentrations which were uniform to at least 5 at.% NiO within the subsequent isotope diffusion zone. The diffusion coefficient of 63 Ni increased with increasing Ni content of the solid solution with an exponential dependence given by D *= (1.55±0.12±10 −11 ) exp (3.16±0.46 [NiO]). The result confirms data previously obtained from Boltzmann‐Matano analysis of interdiffusion specimens, but under conditions where the precise shape of the solute gradient is not essential and where the assumption of rapid local equilibration of defect structure need not be made.