VIBRATIONAL SPECTROSCOPIC INVESTIGATIONS OF LEAD BORATE AND LEAD ALUMINOBORATE GLASSES

Lead berate (PB) and lead aluminoborate (PEA) glasses in the systems x PbO .(100-x)B2O3 (0 less than or equal to x less than or equal to 75 m ol%) and xPbO .(95-x)B2O3, 5Al(2)O(3) (0 less than or equal to x less than or equal to 80 mol%), respectively, have been prepared and invest igated by Raman and infrared reflectance spectroscopy to obtain qualit ative and quantitative information on the structure of glasses. Using the Martin-Brenig model, structural correlation lengths were determina ted from boson peak positions of temperature-reduced Raman spectra and transversal sound velocities. Kramers-Kronig analysis was used to tra nsform the measured infrared reflectance spectra into complex dielectr ic functions. The imaginary part of the complex dielectric function co ntains the absorption properties of the material. A band separation co mputer programme has been used to get more detailed information from t he spectra. Far infrared and low-frequency Raman spectra contain infor mation about vibrations of the PbO component within the network.