Abstract
The composition dependence of boson peaks has been studied by Raman scattering in lithium and cesium borate glass, xM2O-(1−x)B2O3 (M = Li, Cs). The boson peak frequency markedly increases for the increase of the lithium composition, while for the cesium composition the boson peak frequency is nearly constant. It is found that the boson peak frequency clearly correlates with shear modulus. The origin of the boson peak of lithium and cesium borate binary glass is probably the coupled vibration of the libration of boroxol rings and rattling like vibrations of alkali ions. All observed boson peaks of lithium borate glass is scaled by the master curve. It indicates that the distribution of V-DOS remains the same in lithium borate glass. While, the broadening of a boson peak is observed in cesium borate glass. The extension of the distribution of V-DOS is induced probably by the large coordination number of Cs ions inserted in the network structure.
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