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Calcium Diffusion along High‐Diffusivity Paths in Single‐Crystal MgO
Author(s) -
Sakaguchi Isao,
Yurimoto Hisayoshi,
Sueno Shigeho
Publication year - 1992
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.1151-2916.1992.tb07864.x
Subject(s) - lattice diffusion coefficient , thermal diffusivity , activation energy , diffusion , grain boundary diffusion coefficient , ionic conductivity , atmospheric temperature range , chemistry , effective diffusion coefficient , ion , dislocation , ionic bonding , lattice energy , lattice (music) , materials science , analytical chemistry (journal) , crystal structure , crystallography , thermodynamics , grain boundary , medicine , physics , microstructure , organic chemistry , electrode , chromatography , acoustics , magnetic resonance imaging , electrolyte , radiology
The lattice and dislocation diffusion coefficients for Ca 2+ in single‐crystal MgO have been determined in the temperature range 1743 to 1293 K from the diffusion penetration determined using secondary ion mass spectrometry. The dislocation diffusion coefficients were 4 to 5 orders of magnitude larger than the lattice diffusion coefficients in the same temperature range. The activation energy of Ca 2+ lattice diffusion was comparable to that of ionic conductivity. The diffusion mechanism of Ca 2+ is related to Mg vacancies.