Isothermal diffusion of strontium and cobalt ions in pure NaCl crystals and reconsideration of the Soret effect
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 64, 2100-2105
- https://doi.org/10.1039/tf9686402100
Abstract
The tracer diffusion coefficients of Sr2+ and Co2+ ions were measured simultaneously in pure NaCl in the temperature range 600–750°C. The results for Sr2+ differ from previous measurements Used in conjunction with previous Soret measurements they lead to the conclusion that the heat of transport of a Sr2+ vacancy complex is approximately twice the magnitude expected if the heat of transport for each jump were equal to the enthalpy of activation for the jump. The Co2+ diffusion profiles are qualitatively different from those of Sr2+ and exhibit an unexplained region of slow diffusion in the first 65 µ below the surface.Keywords
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