Diffusion kinetic parameters from bulk diffusion limited gas release processes

Details Diffusion kinetic parameters from bulk diffusion limited gas release processes Diffusion kinetic parameters from bulk diffusion limited gas release processes

2007-06-22

arxiv.org/abs/0706.3402v1

Physics

Condensed Matter

Materials Science

Reduced version published as: R. E. Avila Jap. J. Appl. Phys. 43, pp.7205-7206 (2004). (4 pages, 2 Figs.)

Scientific paper

10.1143/JJAP.43.7205

The diffusion of a bulk absorbed gas species out of spherical pebbles is studied analytically, stressing the usefulness of the time integral of the diffusion coefficient for analysis of arbitrary temperature schedule experiments. Highly accurate approximations are introduced where the numeric evaluation of the analytic expressions takes considerable time. A method is proposed to extract the diffusion kinetic parameters from a single linear heating ramp, namely, the activation energy of the diffusion coefficient and the ratio of the corresponding preexponential factor to the radius of spherical pebbles.

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