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Oxygen Self‐Diffusion in Lithium‐Doped Single‐Crystal Magnesium Oxide
Author(s) -
Oishi Yasumichi,
Ando Ken,
Yasumura Kenji
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.tb05649.x
Subject(s) - oxygen , diffusion , lithium (medication) , thermal diffusivity , self diffusion , magnesium , atmospheric temperature range , analytical chemistry (journal) , chemistry , doping , single crystal , evaporation , oxide , inorganic chemistry , ion , crystal (programming language) , materials science , crystallography , thermodynamics , medicine , physics , self service , optoelectronics , organic chemistry , chromatography , marketing , computer science , programming language , business , endocrinology
Oxygen self‐diffusion coefficients for a single‐crystal MgO doped with 400 ppm Li were determined at 848° to 1300°C by isotope exchange technique using 18 O as the tracer. The diffusion coefficient increased with increasing temperature in the lower temperature range, as described by D = 7.8 × 10 −4 exp[−279 (kJ/mol)/RT] cm 2 /s, which was interpreted to be an extrinsic diffusion due to the oxygen vacancies introduced by substitutional Li ions. The oxygen diffusivity tended to decrease above 1050°C, presumably becauuse of evaporation of Li 2 O.