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Oxygen Self-Diffusion In Mgo Grain Boundaries

Published online by Cambridge University Press:  15 February 2011

Michael Liberatore and
Bernhardt J. Wuensch
Michael Liberatore
Affiliation:
Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, Massachusetts 02139
Bernhardt J. Wuensch
Affiliation:
Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, Massachusetts 02139
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Abstract

Oxygen grain boundary diffusion has been studied in low energy (∑5, ∑13) and high energy (asymmetric 16° tilt) MgO grain boundaries. Enhanced diffusion of oxygen was observed in all boundaries, but more so in the general, high energy boundary, by 1 - 2 orders of magnitude. This supports the theory that the better the atomic registry between the adjoining grains the lower the diffusivities in the grain boundary. Also the activation energies for bulk and grain boundary diffusion (in the ∑13 boundaries) were found to be equal to within experimental error. (≈ 3.9eV)

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