ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

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


REFLECTIVITY SPECTRA OF PbO-GeO₂ GLASSES
 
Ležal Dimitrij 1, Návrátil Jiří 2, Pedlíková Jitka 1, Horák Jaromír 1
 
1 Laboratory of Inorganic Materials of the Institute of Inorganic Chemistry ASCR and the Institute of Chemical Technology, Technická 5, 166 28 Praha
2 Joint Laboratory of Solid State Chemistry of Academy of Sciences of the Czech Republic and the University of Pardubice, Náměstí Legií 565, 532 10 Pardubice

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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