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Oxygen Diffusion in Single‐Crystal Zinc Oxide
Author(s) -
Tomlins Gregory W.,
Routbort Jules L.,
Mason Thomas O.
Publication year - 1998
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.1151-2916.1998.tb02421.x
Subject(s) - diffusion , zinc , oxygen , evaporation , isotropy , single crystal , activation energy , materials science , oxide , chemistry , analytical chemistry (journal) , chemical physics , thermodynamics , crystallography , metallurgy , optics , physics , organic chemistry , chromatography
The models used to describe zinc oxide‐based varistors rely on diffusion and defect data obtained using techniques that have been replaced by more modern methods such as secondary ion mass spectrometry. We report values for oxygen diffusivities in undoped, single‐crystal ZnO as a function of temperature and orientation. Evaporation was taken into consideration when analyzing experimental results. Within experimental error, the energetics of diffusion are isotropic, but are slightly faster in the c ‐direction. In comparing diffusion data from the literature, the intrinsic activation energy was estimated to be between 3.6 and 4.2 eV. Comparisons with recent theoretical calculations of relevant defect energies are discussed.