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Enhancement of MgO Evaporation from MgO‐Stabilized ZrO 2 by Grain‐Boundary Diffusion
Author(s) -
SAKKA YOSHIO,
OISHI YASUMICHI,
ANDO KEN
Publication year - 1986
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.1151-2916.1986.tb04712.x
Subject(s) - crystallite , materials science , grain boundary diffusion coefficient , solid solution , evaporation , grain boundary , diffusion , effective diffusion coefficient , kinetics , analytical chemistry (journal) , lattice diffusion coefficient , lattice (music) , phase (matter) , mineralogy , thermodynamics , chemistry , metallurgy , microstructure , medicine , physics , radiology , chromatography , quantum mechanics , acoustics , magnetic resonance imaging , organic chemistry
Preferential evaporation of MgO from cubic 14MgO·86ZrO 2 solid solution was determined for two polycrystals with different grain sizes at 1800° to 2100°C and 7 × 10 –3 Pa. The time dependence of the evaporation rate and the concentration in the solid phase indicated that the evaporation kinetics is controlled by cationic interdiffusion in the solid phase and enhanced by the presence of grain boundaries. The temperature dependence of the lattice diffusion coefficient calculated from the concentration distributions agreed with that previously determined for Mg‐Zr interdiffusion in polycrystalline MgO‐ZrO 2 solid solutions.