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• W2000706269 abstract "In LiNbO3 single crystals doped with 8 mol% Mg and gamma irradiated at 77 K a new trapped-hole defect has been detected. The new defect is characterized by an anisotropic ESR spectrum with a nearly isotropic, partly resolved hyperfine structure due to a single Nb nucleus. The principal g-values are g1=2.029+or-0.010, g2=2.049+or-0.010 and g3=2.006+or-0.010, the Nb hyperfine constant is A=1.5+or-0.2 mT. The new spectrum is attributed to a hole localized on an oxygen ion and stabilized by a substitutional Mg2+ ion on the nearest-neighbour Nb site, with an appreciable spin density on the other close Nb neighbour of the oxygen. The new defect, called the O-(Mg) centre, appears in these crystals together with OH2- trapped electron centres reported recently. The O-(Mg) centres can be produced in larger concentrations if the crystal contains, in addition to an over-threshold (6-8 mol%) amount of Mg, also the Fe dopant. This is attributed to the electron-trapping capabilities of Fe3+ centres. The O-(Mg) centre decays in the temperature range 170-230 K, i.e. is more stable than the O- centre reported previously for undoped or weakly Mg-doped LiNbO3." @default.
• W2000706269 created "2016-06-24" @default.
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• W2000706269 date "1991-10-28" @default.
• W2000706269 modified "2023-10-15" @default.
• W2000706269 title "A new trapped-hole radiation defect in heavily Mg-doped LiNbO₃" @default.
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• W2000706269 doi "https://doi.org/10.1088/0953-8984/3/43/012" @default.
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