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Bulk diffusion limitations and phase boundary kinetics inferred using specimen resistance change

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Abstract

When a gas dissolves into a solid at constant temperature, the electrical resistance of the solid specimen is usually altered in a readily measurable fashion. However, such resistance changes can be simply interpreted in terms of phase boundary kinetic parameters only when bulk diffusion is sufficiently rapid to eliminate solute concentration gradients within the specimen. If this condition isnot fulfilled, inferred kinetic constants must be corrected for the effects of solute diffusion limitations, since the measured resistance is no longer dependent only ontotal gas content, but rather on its spatialdistribution within the specimen. A simple procedure for accomplishing this correction is presented herein, based on the recognition that: i) measured electrical resistance is a particularfunctional of the internal solute distribution, and ii) the latter distribution must at every instant be compatible with the laws governing transient diffusion within the specimen. Illustrative results are presented for the transient engassing of foils or filaments when the resistivity change is linear in local solute concentration. Applications are given to: i) the inference of kinetic parameters from resistance-time data, and ii) the design of kinetic experiments “free” of an appreciable bulk diffusion effect.

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Authors and Affiliations

  1. Engineering and Applied Science,Chemical Engineering Group, Yale University, New Haven, Conn.

    Daniel E. Rosner (Associate Professor)

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  1. Daniel E. Rosner
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Rosner, D.E. Bulk diffusion limitations and phase boundary kinetics inferred using specimen resistance change. Metall Trans 3, 2493–2499 (1972). https://doi.org/10.1007/BF02647054

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  • DOI: https://doi.org/10.1007/BF02647054

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