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. |
 PDF (0.4 MB) |
|
