Proton activation and autoradiography were combined to measure 18 O grain‐boundary diffusion in undoped and Fe‐doped MgO bicrystals. Additions of 7000 ppm Fe enhance O grain‐boundary diffusion at 1700°C by at most a factor of 5 over that in samples that contain 1000 atomic ppm total Al and Ca. From these results, the relative importance of grain‐boundary and volume diffusion to O transport in dense polycrystalline MgO at 1700°C was estimated.
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McKenzie et al. (1971) studied this question.
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