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Oxygen Mobility in Polycrystalline NiCr 2 O 4 and α‐Fe 2 O 3
Author(s) -
KINGERY W. D.,
HILL D. C.,
NELSON R. P.
Publication year - 1960
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.1151-2916.1960.tb13699.x
Subject(s) - oxygen , crystallite , diffusion , activation energy , analytical chemistry (journal) , nichrome , chemistry , diffusion equation , materials science , crystallography , thermodynamics , physics , organic chemistry , economy , chromatography , economics , service (business)
Oxygen diffusion coefficients have been determined for polycrystalline samples of NiCr 2 O 4 and α‐Fe 2 O 3 by exchange measurements with oxygen gas containing the stable isotope 18 O, using mass spectrometer analysis. Oxygen diffusion in NiCr 2 O 4 can be represented by the equation D = 0.017 exp (‐65,400/RT); oxygen diffusion in α‐Fe 2 O 3 can be represented by the equation D = 1 × 10 11 exp (‐146,000/RT). The large difference between D 0 and activation energy for these materials suggests that different diffusion mechanisms are involved.