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- W2017357153 abstract "Congruent SBN and BCT crystals doped with Fe, Cr, Ce to enhance photorefractive properties, are investigated at low temperature (T > 1 K) under illumination with Ar☎- and Kr☎-laser light. Light-induced absorption changes in a wide spectral range from UV to IR indicate photoinduced charge transfer processes from impurities to polaronic centers. Broad NIR absorptions (at about 0,7 eV) associated with Ti3☎ polarons in BCT or with Nb4☎ polarons in SBN are observed and their non-linear behaviour with illumination intensity, polarization and temperature is described on the basis of the simple model for the photo charge transport (in SBN: Ce3☎☎ Nb5☎↔Ce4☎☎Nb4☎). A broad visible absorption VIS (at about 2 eV) appearing together with the NIR polarons, is shown by photodissociation (with a Kr☎-laser) to consist at least partly of small polarons (in BCT and SBN)." @default.
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- W2017357153 date "2003-01-01" @default.
- W2017357153 modified "2023-09-26" @default.
- W2017357153 title "Light-Induced Polaronic Absorption at Low Temperature in Pure and (Fe, Ce, Cr) Doped SrxBa1-xNb2O6or Ba1-yCayTiO3Crystals and Photodissociation of Vis Centers Into Small Polarons" @default.
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- W2017357153 doi "https://doi.org/10.1080/1042015021000052656" @default.
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