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Diffusion in alumina
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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)].

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

log D vs for selected substances diffusing in alumina. References are in Table VI.


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Table I.

Classification of diffusing substances in alumina.

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Table II.

(A) Volume diffusion of impurities in alumina. (B) volume diffusion of impurities in polycrystalline Lucalox alumina. The value in perenthese denotes a long extrapolation.

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Table III.

Volume diffusion of oxygen and aluminum in alumina.

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Table IV.

Effects of impurities added to alumina on the diffusion coefficients of oxygen, as compared to undoped material.

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Table V.

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.

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Table VI.

References for Fig. 5.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Diffusion in alumina