Low-frequency Raman scattering and small-angle X-ray scattering of glasses inclined to phase decomposition |
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| Institution: | 1. Key Laboratory of Mineral Processing Efficient Utilization, School of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. Department of Chemical Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan;3. Uranium Mining and Extraction Directorate, Jordan Atomic Energy Commission, Shafa Badran, Amman 11934, Jordan |
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| Abstract: | Low-frequency (<1000 cm?1) Raman scattering of lithium aluminosilicate (12Li2O : 15Al2O3 : 73SiO2 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. |
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