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New Raman scattering lines (at 463cm −1 and at 156cm −1 ) induced by strong enough optical pumping in nominally pure KTaO 3 crystals are manifested. The model of such effect is proposed. This model is based on the light-induced formation of metastable polar clusters constructed from bi-polaronic excitons – Charge Transfer Vibronic Excitons (CTVEs) with their high degree alignment...
Sol–gel zirconia films doped with Eu 3+ concentrations ranging from 0.2% to 10%, were prepared by dip-coating a solution of the starting precursor, zirconium n-propoxide, ethanol, methanol, water, acetic acid and europium nitrate on glass and SiO 2 /Si wafer substrates. The ZrO 2 sol thus synthesized remains stable for several months. Structural characterization of the zirconia...
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