Abstract
Lattice site location and local environment characterization of implanted 111Ag in SrTiO3 by means of the emission channeling (EC) and γ–γ perturbed angular correlation (PAC) techniques are reported. The angular distribution of β− particles emitted from the 111Ag decay was monitored with a position-sensitive detector as a function of annealing temperature up to 900°C. In the as-implanted state Ag occupies several lattice sites in SrTiO3. Upon annealing, near-Sr and near-Ti occupancies increased to 64% and 18%, while an octahedral interstitial fraction vanished. Ag atoms on near-Sr and near-Ti sites are still displaced by ∼0.2Å from ideal cubic positions. Subsequent PAC measurements confirmed that ∼20% of 111Ag atoms are in specific sites of non-cubic environment, characterized by a unique electrical-field-gradient (EFG), while ∼80% were subject to a wide EFG distribution.
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