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- W2024493708 abstract "Raman spectroscopy is used to characterize the NbF5 phases in the temperature range 80–500 K. A new clear glass is formed by quenching the melt to liquid nitrogen temperatures having a glass transition at ∼206 K and crystallization at ∼233 K. For all phases including the melt, the glass, the supercooled liquid, the crystalline solid and the gas, the Raman spectra show a rather common high frequency band at ∼760 cm−1 which is attributed to the Nb–F terminal frequency of partially bridged ‘NbF6’ octahedra. Based on the systematics of the Raman spectra for all phases and the literature physicochemical data a model is proposed for the glass and the liquid phases where ‘NbF6’ octahedral bridged in cis and/or trans configurations form a variety of cyclic and/or chain structures which intermix building up the overall structure. At exceptionally low energies (<11 cm−1) a rather weak in intensity Boson peak is observed in the glass which shifts to even lower energies with increasing temperature. Librational and/or tortional motions of the bridged octahedra participating in the glass structure are possible candidates for the origin of this peak." @default.
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- W2024493708 date "2008-12-01" @default.
- W2024493708 modified "2023-10-16" @default.
- W2024493708 title "Octahedral fluoride glasses: Raman spectra and structure of niobium pentafluoride" @default.
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- W2024493708 doi "https://doi.org/10.1016/j.jnoncrysol.2008.08.005" @default.
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