| Title: |
Characterization of optical glasses by Rayleigh and Mandel'shtam-Brillouin scattering and high temperature acoustic methods. Part 1. Flint glasses. |
| Authors: |
Anan'ev, Anatoli V.; Ananyev, Vladislav A.; Bogdanov, Viktor N.; Maksimov, Leonid V. |
| Source: |
Physics & Chemistry of Glasses: European Journal of Glass Science & Technology Part B; Feb2015, Vol. 56 Issue 1, p15-23, 9p |
| Subject Terms: |
OPTICAL glass; RAYLEIGH scattering; ACOUSTICAL materials |
| Abstract: |
Commercial flint glasses with compositions xR2O-(100-x)SiO2+(24·0±0·9), PbO(8·4±0·2)R2O-91·4±0·6)SiO2+xPbO, (10·3±0·2)R2O-(89·7±0·2)SiO2+xPbO, (12·1±0·2)R2O-(87·9±0·2)SiO2+xPbO (mol%) (R=Na+K) series were studied by Rayleigh and Mandel'shtam-Brillouin scattering (RMBS) spectroscopy and acoustic methods. Landau-Placzek ratios, RL-P, and elastic moduli were determined from RMBS spectra of the glasses and compared with reference data. Composition dependencies of RL-P were discussed in terms of "freezing" concentration, density, and anisotropy fluctuations in a glass melt on cooling. Use of high temperature acoustic data allowed separation of the contributions of various fluctuations to RL-P. Selective inclusion of Pb in alkali-enriched concentration inhomogeneities of alkali silicate hosts has been verified by RMBS measurement results. It is supposed that a RMBS spectrometer might be used instead of instrumentation for measuring light scattering loss coefficients, elastic and elasto-optic parameters of commercial optical glasses. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |