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- W1020044709 abstract "Off-stoichiometric glasses in the Ba–Ga–Ge–Se system with Se excess or deficiency (BGGS ± Se) are synthesized and their structure is characterized using Raman and multinuclear (77Se, 71Ga) magic-angle-spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The results reveal that the structure of these off-stoichiometric BGGS ± Se glasses consists of a charge-compensated, partially covalent network of corner-sharing (Ga/Ge)Se4 tetrahedra where [GaSe4]− tetrahedra charge balance the Ba2 + cations. Addition of excess Se to a stoichiometric BaSe–Ga2Se3–GeSe2 glass with BaSe:Ga2Se3 > 1 results in the formation of Se–Se linkages, while Se deficiency is accommodated via the formation of homopolar Ge–Ge bonds, in agreement with the continuously-alloyed structural scenario of purely covalent chalcogenide glasses. Such composition-dependent structural evolution is shown to be consistent with the corresponding variation in density and glass transition temperature." @default.
- W1020044709 created "2016-06-24" @default.
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- W1020044709 date "2015-11-01" @default.
- W1020044709 modified "2023-10-18" @default.
- W1020044709 title "Structure and properties of off-stoichiometric Ba–Ga–Ge selenide glasses" @default.
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- W1020044709 doi "https://doi.org/10.1016/j.jnoncrysol.2015.07.023" @default.
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