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Oxygen Tracer Diffusion in Polycrystalline Calcium‐Doped Lanthanum Chromites
Author(s) -
Yasuda Isamu,
Ogasawara Kei,
Hishinuma Masakazu
Publication year - 1997
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.1151-2916.1997.tb03226.x
Subject(s) - lattice diffusion coefficient , grain boundary diffusion coefficient , tracer , analytical chemistry (journal) , grain boundary , effective diffusion coefficient , oxygen , crystallite , vacancy defect , lanthanum , acceptor , chemistry , materials science , doping , inorganic chemistry , crystallography , condensed matter physics , microstructure , medicine , physics , optoelectronics , organic chemistry , chromatography , nuclear physics , magnetic resonance imaging , radiology
Oxygen tracer diffusion in polycrystalline (La,Ca)CrO 3−delta was studied by the gas‐solid isotope exchange reaction in combination with a depth‐profiling technique using secondary‐ion mass spectroscopy, which allowed determination of coefficients of lattice and grain‐boundary diffusion separately. A significant contribution of fast grain‐boundary diffusion was confirmed. The lattice diffusion coefficient increased with increased acceptor content and decreased oxygen partial pressure, which was consistent with the currently established point defect model and, thereby, suggested that the lattice oxide ions diffused by a vacancy mechanism.