Samples of 65 μm‐grain‐size AL 2 O 3 containing 0.05 wt% Mg and 40 μm‐grain‐size AL 2 O 3 containing 0.13 wt% Mg, both MgO‐saturated, undergo compressive deformation in the range 1580° to 1800°C with results interpreted as diffusional creep rate‐limited by grain‐boundary diffusion with the Coble boundary‐diffusion model giving image A lower deformation rate for an unsaturated composition indicates that MgO additions enhance grain‐boundary diffusion.
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Mocellin et al. (1971) studied this question.
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