Presa Muñoz De Toro, Patricia Marcela De LaLieb, K. P.Uhrmacher, M.Ziegeler, L.2023-06-202023-06-202000-010932-078410.1515/zna-2000-1-242https://hdl.handle.net/20.500.14352/60213© Verlag der Zeitschrift für Naturforschung. International Symposium on Nuclear Quadrupole Interactions (XVth NQI 99) (15. 1999. Leipzig, Germany). This work has been supported by the Deutsche Forschungsgemeinschaft, Bonn.The quadrupole hyperfine interactions of ^111Cd/^111 probe nuclei in single-crystalline SrTiO₃ perovskite samples were investigated using Perturbed Angular Correlation spectroscopy. Three electric field gradients were detected and their fractions and hyperfine parameters were measured in the temperature range from 26 to 700 K. The fraction f₀ having a vanishing quadrupole frequency, as expected for ^111Cd on substitutional sites in a cubic lattice, starts to develop around 300 K and reaches 100% at 700 K. Two well-defined EFG's having closely lying quadrupole frequencies and asymmetry parameters of ω_(Q1) = 49.1(3) Mrad/s, η_(1) = 0.10(2) and ω_(Q2) = 51 8(3) Mrad/s, η_(2)= 0.12(2), at room temperature, were identified in the temperature range from 250 to 530 K, and their (100) orientation in the lattice was determined. They are associated with electronic defects at the probe atoms.engjournal articlehttp://dx.doi.org/10.1515/zna-2000-1-242https://www.degruyter.comopen access538.9Electric-field gradientsCorrelation spectroscopyHyperfine interactions^111CdRelaxationDefectsOxidesPacFísica de materialesFísica del estado sólido2211 Física del Estado Sólido