Abstract
Using electron paramagnetic resonance, optical absorption, and fast spectroscopy of light-induced absorption changes, it is shown that codoping BaTiO3:Rh with NaBa acceptors raises the charge state of Rh3+ to Rh4+. Subsequent oxidation under high oxygen pressures can lower the Fermi level to Rh4+/5+, leading to increased infrared absorption. The light-induced charge transfer in such specimens is characterised by “one center” behaviour.
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