Abstract
An impurity mediated mechanism of photorefractive effect in BaTiO3 is proposed. The photoinduced changes in the relative concentration of Fe3+ in BaTiO3 results in an electro-optic coupling through a combination of the Sangster and piezoelectric effects. This is based on the examination of the extensive results on the EPR of Fe3+ in the BaTiO3 lattice. This model explains the improved photorefractive behavior of BaTiO3 on doping with Co2+.
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Sastry, M.D., Moghbel, M. & Venkateswarlu, P. Impurity mediated mechanism of photorefractive effect in BaTiO3: A combination of sangster and piezoelectric effects. Pramana - J Phys 47, 331–337 (1996). https://doi.org/10.1007/BF02848533
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DOI: https://doi.org/10.1007/BF02848533