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Secondary Ion Mass Spectroscopy Study of Oxygen‐18 Tracer Diffusion in 2/1‐Mullite Single Crystals
Author(s) -
Fielitz Peter,
Borchardt Günter,
Schmücker Martin,
Schneider Hartmut,
Wiedenbeck Michael,
Rhede Dieter,
Weber Sylvian,
Scherrer Stanislas
Publication year - 2001
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.1151-2916.2001.tb01103.x
Subject(s) - mullite , oxygen , analytical chemistry (journal) , tracer , diffusion , enthalpy , atmospheric temperature range , chemistry , anisotropy , activation energy , spectroscopy , ion , materials science , thermodynamics , ceramic , physics , organic chemistry , chromatography , quantum mechanics , nuclear physics
Oxygen 18 O tracer diffusion in Czochralski‐grown mullite single crystals is investigated along [010] and [001]. Oxygen diffusion coefficients range between ∼5 × 10 −20 m 2 /s (1250°C) and ∼9 × 10 −18 m 2 /s (1525°C). The data does not show any significant anisotropy. The values of the activation enthalpy (4.5 eV) and of the activation entropy ((3.4 ± 1.6) k B , where k B is the Boltzmann constant) suggest that the atomic transport occurs via thermally activated vacancies.