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Lifetime spectra of positrons is oxides were measured. Densities of oxygen ions corrected for the ionicities are rather good parameters describing τ 1 -1 and thus positrons may be itinerant in oxides. The annihilation rates τ 1 -1 are about 1.5 times as large as those which are calculated on the assumption that the positrons distribute homogeneously.
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NOGUCHI et al. (1972) studied this question.
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