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• W2002100979 abstract "The effect of X-irradiation on the absorption spectra of pure and impurity (Cu, Mn, Ni, Eu)-doped LiNbO3 has been systematically investigated. Three main bands with peaks at 1.6, 2.5 and 3.2 eV have been observed in pure crystals or Mn-, Ni- and Eu-doped crystals after low-temperature (10K) irradiation. For the Cu-doped samples, a competition is apparent between the production of these bands and the conversion of Cu2+ (1.2 eV band) into Cu+ (3.1 eV band). From this information and the thermal annealing behaviour of optical bands together with a comparison with the EPR data of Schirmer and Von der Linde (1978), the following assignment of optical bands has been made: the 1.6 eV band to polaron (Nb4+) states; the 2.5 and 3.2 eV bands to holes trapped at Li vacancies or other lattice defects. The reduction treatments induce a broad absorption made up of two main bands at 2.6 and 3.2 eV. Optical bleaching experiments at 10K, turn these bands into the same 1.6 eV (polaron) band of irradiated crystals. For Mn- and Cu-doped samples those treatments induce, as a first stage, the reduction of Mn3+ and Cu2+ which is then followed by the formation of the same bands of pure crystals. These results have led us to associate both bands with F centres (2.6 eV) and F+ centres (3.2 eV)." @default.
• W2002100979 created "2016-06-24" @default.
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• W2002100979 date "1984-01-30" @default.
• W2002100979 modified "2023-09-23" @default.
• W2002100979 title "Defects induced in pure and doped LiNbO₃by irradiation and thermal reduction" @default.
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• W2002100979 doi "https://doi.org/10.1088/0022-3719/17/3/021" @default.
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