Log diffusion coefficients as a function of reciprocal temperature for diffusion in alumina ◻. Hydrogen (Ref. 1); 엯 water (Ref. 9); water (Ref. 10). Lines, least-square fits.
Profile of chromium that diffused into an alumina bicrystal after at . From Ref. 16, Fig. 1. Points, experimental data, vs , is the distance from the surface.
Profile of chromium that diffused into an alumina bicrystal after at . From Ref. 16, Fig. 1. (Data from Fig. 2). Points, experimental data, solid line proportional to concentration, dashed line, constant with chromium concentrations [Eq. (5)].
Experimental data for volume diffusion of oxygen in alumina. (엯) Refs. 34 and 35; (×) Refs. 36 and 37; Ref. 38; (+) Refs. 32 and 33; (◻) Ref. 39. Lines from least-squares analysis.
log D vs for selected substances diffusing in alumina. References are in Table VI.
Classification of diffusing substances in alumina.
(A) Volume diffusion of impurities in alumina. (B) volume diffusion of impurities in polycrystalline Lucalox alumina. The value in perenthese denotes a long extrapolation.
Volume diffusion of oxygen and aluminum in alumina.
Effects of impurities added to alumina on the diffusion coefficients of oxygen, as compared to undoped material.
Diffusion coefficients calculated from deep penetration tails on diffusion profiles in alumina. In sapphire (single crystals) the diffusion is presumed to be along dislocations, where in polycrystalline material along grain boundaries.
References for Fig. 5.
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