Low-frequency Raman scattering and small-angle X-ray scattering of glasses inclined to phase decomposition

• Published in: Journal of non-crystalline solids Vol. 243; no. 2; pp. 244 - 250
• Main Authors: Chuvaeva, T.I, Dymshits, O.S, Petrov, V.I, Tsenter, M.Ya, Zhilin, A.A, Golubkov, V.V
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.1999
• Subjects: 78.30.Ly; 61.10.Eq; R110; 63.50.+x; T150
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/S0022-3093(98)00824-2

Low-frequency (<1000 cm −1) Raman scattering of lithium aluminosilicate (12Li 2O : 15Al 2O 3 : 73SiO 2 with 4 mol% TiO2) glasses with addition of titanium dioxide has been studied. With a heat treatment at temperatures 660°C, 700°C, 720°C and 820°C and for various times and sequences of temperature, our samples decompose into nanometer sized dispersed aluminotitanate particles. In Raman spectra of these glasses an evolution of a boson peak was observed. The width of the relatively broad boson band decreases as does the frequency of the band. From small-angle X-ray scattering data we conclude that the boson peak is connected with elastic vibrations of amorphous or crystalline regions of inhomogeneity with a dimension of ∼1.7 nm in initial glasses or larger depending on the heat treatment sequences.