RAMAN-SPECTROSCOPIC DETERMINATION OF BOROXOL AND BORATE RING CONTENTSIN LEAD BORATE GLASSES

Glasses in the system xPbO.(100 - x)B2O3 (0 less-than-or-equal-to x le ss-than-or-equal-to 30 mol.%) were studied by Raman spectroscopy. The conversion of boroxol rings into borate rings containing one or two BO 4 groups due to the transformation of threefold to fourfold coordinate d boron with increasing content of lead oxide was determined from the intensities of the Raman peaks at 805 and 770 cm-1. Quantitative measu rements were carried out on highly finished spherical samples to allow different reflection losses of the samples to be taken into account.