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- W2008289962 abstract "Optical properties of sodium tetratungstate (Na2W4O13) crystals have been studied in a wide temperature range from 9 to 300 K with use of synchrotron radiation and D2 lamp as light sources. The reflectivity spectra exhibit appreciable anisotropy for polarized light with the electric vector parallel and perpendicular to the c axis. A sharp reflection peak due to the excitonic transition is observed at 3.65 eV for both polarizations at 9 K. A luminescence band peaking at 2.33 eV is stimulated under the excitation with photons in the fundamental absorption region. This luminescence has a decay time of 52 μs at 9 K, and is thermally quenched at around 200 K with an activation energy of 220 meV. The 2.33-eV luminescence is ascribed to radiative decay of excitons self-trapped at octahedral WO6 groups. These results are compared with those obtained in other tungstates." @default.
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- W2008289962 date "2001-05-01" @default.
- W2008289962 modified "2023-09-23" @default.
- W2008289962 title "Optical properties of Na2W4O13 crystals" @default.
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- W2008289962 doi "https://doi.org/10.1016/s0025-5408(01)00626-2" @default.
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