Ceramics-Silikáty 41 (3) 95-97 (1997) 

REFLECTIVITY SPECTRA OF PbO-GeO₂ GLASSES 

D. Ležal, J. Navrátil, J. Pedlíková, J. Horák

Glasses of the composition of (PbO)_x (GeO₂)_1-x with x = 0.3-0.5 were prepared by melting a mixture of starting pure oxides PbO and GeO₂. The samples of the thickness of about 3 mm with perfectly polished surfaces were used for the measurement of the reflectivity spectra in the region of 2500-200 cm^-1. The observed bands in the obtained reflection spectra were compared with the published infrared absorption spectra. The observed shift of the reflection bands in the region of 750-900 cm^-1 with a change in the PbO content in the glasses correspond to those observed in the absorption spectra. This shift is ascribed to an increase in the number of non-bridging oxygen atoms per Ge tetrahedron. In the lower frequency region around 500 cm^-1 and 300 cm^-1 were observed another two reflection bands which can be probably ascribed to a O-Ge-O stretching and deformation mode, respectively.

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