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Diffusion Mechanisms in Transition-Metal Oxides

Published online by Cambridge University Press:  21 February 2011

N. L. Peterson
N. L. Peterson*
Affiliation:
Materials Science and Technology Division Argonne National Laboratory, Argonne, IL 60439
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Abstract

Results are presented for cation self-diffusion in Cu2O and Cr2O3 as a function of temperature and deviation from stoichiometry. A defect model for Cu2O involving neutral and singly charged copper vacancies, electron holes, and singly charged oxygen-interstitial ions is developed and fit to the tracer-diffusion data, the electrical-conductivity data, and the stoichiometry data, yielding concentrations and mobilities of these defects. The diffusion results for Cr2O3 single crystals indicate that cation self-diffusion takes place by triply charged vacancies and that previous diffusion results for polycrystalline Cr2O3 are dominated by grain-boundary diffusion.

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References

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