Iran doped barium titanate was grown and reduced at various temperatur
es. Using optical absorption and electron paramagnetic resonance (phot
o-EPR) simultaneously, a wide absorption band at similar to 2.1 eV due
to Fe2+ is established. The light-induced charge transport between Fe
2+/3+ and shallow Ti4+3+-V-0 is identified, showing a two-center type
response at low and one-center type response at room temperature. (C)
1997 American Institute of Physics.