The results of positron-annihilation lifetime spectroscopy measurements on undoped, electron-irradiated, and Nb-doped SrTiO₃ single crystals are reported. Perfect lattice and vacancy defect positron lifetimes were calculated using two different first-principles schemes. The Sr-vacancy defect-related positron lifetime was obtained from measurements on Nb-doped, electron-irradiated, and vacuum-annealed samples. Undoped crystals showed a defect lifetime component dominated by trapping to Ti vacancy-related defects.
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Mackie et al. (2009) studied this question.
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