Инд. авторы:	Osipov A.A., Osipova L.M.
Заглавие:	Structure of lithium borate glasses and melts: Investigation by high temperature Raman spectroscopy
Библ. ссылка:	Osipov A.A., Osipova L.M. Structure of lithium borate glasses and melts: Investigation by high temperature Raman spectroscopy // Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B. - 2009. - Vol.50. - Iss. 6. - P.343-354. - ISSN 0031-9090.
Внешние системы:	SCOPUS: 2-s2.0-77952809794;
Реферат:	eng: Raman spectra of xLi2O.(1-x)B2O3 glasses and melts (x=0.05, 0.1, 0.15, 0.25 and 0.4) have been measured and analysed in the temperature range from 20 to 1000°C. Modelling of mid frequency (650-900 cm-1) and high frequency (1200-1650 cm-1) spectra ranges has been performed to determine quantitative information about the structural changes in the samples, depending on composition and temperature. Concentrations of the fundamental structural units were determined as a result of modelling of the high frequency spectra contours. The fraction of four-fold coordination boron atoms, N4 decreases with temperature increase. Dynamic equilibrium between structural units in the melts is given by (BØ4/2⇄BØ2/2O- (Ø - bridging oxygen; O- -nonbridging oxygen). A dominating mechanism of the structural change of the glasses with x≤0.15 as a function of heating and fusion is a process of destruction of the boroxol rings. Structural changes in the intermediate range order for x>0.15 are not limited by the dissociation of boroxol rings, but are also connected with the transformations between other superstructural groupings and their destruction.
Ключевые слова:	Raman spectroscopy; Raman scattering; Oxygen; Lithium; Heating; Boron compounds; Boron; Temperature range; Temperature increase; Structural unit; Structural change; Glass; Quantitative information; Non-bridging oxygen; Mid-frequency; Lithium borate glass; Intermediate range order; High temperature; High frequency; Dynamic equilibria; Bridging oxygen; Boroxol ring; Boron atom; Raman spectra;
Издано:	2009
Физ. характеристика:	с.343-354