The results of positron-annihilation lifetime spectroscopy measurements on

undoped, electron-irradiated, and Nb-doped SrTiO3 single crystals were 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 vacuumannealed

samples. Undoped crystals showed a defect lifetime component

dominated by trapping to Ti vacancy-related defects.

Vacancy Defect Positron Lifetimes in Strontium Titanate. R.A.Mackie, S.Singh,

J.Laverock, S.B.Dugdale, D.J.Keeble: Physical Review B, 2009, 79[1], 014102