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In order to clarify the influence of Bi-doping on oxygen diffusion in ZnO, the bulk and grain boundary oxygen diffusion coefficients were measured in Bi 2 O 3 -doped ZnO polycrystals by means of the gas-solid exchange method using the isotope 18 O as the oxygen tracer. The experiments were performed on ZnO sintered samples containing 0.1, 0.3 and 0.5 mol% Bi 2 O 3 . The diffusion annealings were performed at 942, 1000 and 1092 °C, in an Ar+ 18 O 2 atmosphere under an oxygen partial pressure ofdoi:10.1590/s1516-14392008000200019 fatcat:qh2uypq435cqdmq6fvd7ouatzq