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1971•Journal of the American Ceramic SocietyRequires access

Oxygen Grain‐Boundary Diffusion in MgO

D.R. McKenzie, Alan W. Searcy, Jason Holt, R.H. Condit

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Abstract

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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What this paper is about

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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Available abstract

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.

Key concepts: Grain boundary diffusion coefficient, Grain boundary, Diffusion, Crystallite, Materials science, Effective diffusion coefficient, Oxygen, Analytical Chemistry (journal)

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