Raman spectroscopy of crystalline, glassy, and molten states of lead diborate

摘要

Polarized Raman spectra of single crystals of lead diborate, PbB4O7 (PBO), are studied in detail at 300 K. The TO-, LO-, and IO-phonon lines of the A (1), A (2), B (1), and B (2) symmetries in the Raman spectra of this compound are assigned. Changes in the Raman spectra of the internal vibrations of boron-oxygen complexes upon transition from the crystalline to the glassy and the molten states of PBO are observed. On the basis of the obtained results, the regularities in the formation of boron-oxygen complexes in glasses, melts, and crystals of the PbO center dot 2B(2)O(3), SrO center dot 2B(2)O(3), and Li2O center dot 2B(2)O(3). diborate compositions are analyzed.