An overview on paramagnetic defects in BaTiO 3 single crystals, used in photorefractive applications, is given. New results concerning cation defects include the investigation of double quantum transitions in isolated F 3+ , identification of the parameters of Fe 4+ -V 0 , analysis of Co 2+ , the report of Co 4+ -V 0 , Jahn-Teller-induced spin-lattice relaxation effects of Pt 3+ , identification of Rh 2+ , Rh 4+ , Ir 4+ and Pt 5+ . In the field of anion defects O - trapped hole centres associated with unknown acceptors and with Al 3+ are reported. The role of the identified defects in light-induced charge transport processes is discussed.
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Possenriede et al. (1992) studied this question.
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