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The effect of material purity on grain boundary (GB) width and energy is investigated by GB self-diffusion measurements in Ni. The effect of matrix purity is examined for the first time for the low temperature C regime of GB diffusion. Grain boundary self-diffusion is measured in Ni of 99.99wt.% purity in both B and C kinetic regimes, and the diffusional GB width δ was determined as δ=0.6nm. This...