Communication

Oxygen diffusivity in MoO₃ as determined by a temperature programmed method
T.P. St. Clair, J.M. Restad, S.T. Oyama
(Virginia Polytechnic Institute and State University)

It is well established that solid state diffusivities can be indirectly measured by monitoring the concentration of a species at an external surface. A relationship can then be formulated that correlates the external concentration with an internal gradient. For example, if the rate of loss of a diffusing species can be measured, then a flux can be calculated, which in turn can be applied to an appropriate solution of Fick's equation to give the diffusivity (D). A technique for determining diffusivities has been previously applied to the oxygen-vanadium system, in which case the diffusivity of oxygen in V₂O₅ was determined using a temperature programmed method.
Keywords: insulators; diffusion; powder
Order No.: JA806-006 © 1998 MRS

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