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- W2013748610 abstract "A Raman scattering study of alkali borate glasses in the system xR2O · (1 − x)B2O3 for R = Li, Na, K has been carried out to understand the role of the mass of the cation in determining the B-O network in glasses. Raman results show that lighter cations favour a stronger B-O network in which three-dimensional BO4 groups are attached to a large borate ring while the heavy cations are not easily inserted in the network interstices. The introduction of heavy cations favours the formation of non-bridging oxygens which make the B-O network comparatively weak and hence result in a decrease of the glass transition temperature (Tg). The short correlation range in these glasses for different R+ has also been estimated and its dependence on the mass of R+ is discussed in terms of a coordination change of boron from three to four. The frequency and temperature-reduced intensities have been calculated for these glasses, and it has been found that the temperature-reduced Raman spectra represent the true vibrational density-of-states. This result also corresponds well to theoretical results obtained on the basis of the Martin-Brenig model. A band around 770 cm−1 whose position varies with changes in both the composition and the alkali ion is explained by considering a simple model based on two weakly coupled harmonic oscillators." @default.
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- W2013748610 date "1995-01-01" @default.
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- W2013748610 title "Cation dependence of raman scattering in alkali borate glasses" @default.
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- W2013748610 doi "https://doi.org/10.1016/0022-3697(94)00130-8" @default.
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