The isotope effect for cation self-diffusion was determined by simultaneous diffusion of ⁵⁷Ni and ⁶⁶Ni tracers in NiO crystals. The strength of the isotope effect fΔK is 0.613 ±{} 0.021, independent of temperature in the range from 1201 to 1678 ^∘{}C. This result is consistent with cation self-diffusion by a vacancy mechanism only, and ΔK=0.784±0.027.
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Volpe et al. (1971) studied this question.
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