Isotope effect for cation self-diffusion in CoO crystals

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Abstract
Diffusion of Co50 in CoO single crystals has been measured in the temperature range from 963 to 1638°C in air by the tracer-sectioning technique. The temperature dependence of the diffusion coefficient for Co60 is given by the expression The isotope effect for cation self-diffusion was determined by simultaneous diffusion of Co55 and Co60 tracers in CoO crystals. The strength of isotope effect defined by was 0. 582±0. 009 independent of temperature in the range from 1081 to 1411 °C. By comparing the experimental value of E60 with the calculated values for the various possible diffusion mechanisms, it has been concluded that the cations diffuse by a vacancy mechanism in CoO, and the ΔK is 0. 746.