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Influence of Ionic Charge on Diffusion in the Surface Layer of Magnesia
Author(s) -
Lin ChangMing,
Stubican Vladimir S.
Publication year - 1987
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.1151-2916.1987.tb04989.x
Subject(s) - arrhenius plot , diffusion , thermal diffusivity , arrhenius equation , ionic bonding , surface diffusion , surface layer , analytical chemistry (journal) , divalent , activation energy , ion , chemistry , diffusion layer , effective diffusion coefficient , layer (electronics) , self diffusion , materials science , chemical physics , thermodynamics , adsorption , physics , organic chemistry , medicine , self service , chromatography , radiology , marketing , magnetic resonance imaging , business
The diffusion of 57 Co isotope on the MgO (100) surface was investigated by the edge‐source method. The surface diffusion parameter, αD s δ, where α is the segregation factor, D s the surface diffusion coefficient, and δ the thickness of the high‐diffusivity layer, was determined over the temperature region 750° to 1250°C. An Arrhenius plot shows a break at ∼1100°C. Below this temperature ionic or localized transport predominates and above it nonlocalized transport seems to predominate. The divalent Co ion diffuses faster than the trivalent Cr ion in the surface layer. The apparent activation energies for the localized surface diffusion of 57 Co and 59 Cr are 59±12 and 110±12 kj/mol, respectively.