INFRARED SPECTRA OF VITREOUS GERMANIUM DIOXIDE.
ROCHESTER UNIV N Y DEPT OF CHEMICAL ENGINEERING
Pagination or Media Count:
The infrared absorption and reflection spectra of vitreous germanium dioxide were measured in the frequency region 4,000 to 80cm. A short range order that can characterize the vitreous GeO2 network is derived from the x-ray work of Nelson, Siegel and Wagner and Smith and Isaacs. A vibrational analysis involving the calculation of the vibrational frequencies of the normal modes of the average structural unit was carried out using the Wilson FG-Matrix technique and a group theoretical method. Three force constants were obtained and the sixteen corresponding frequencies so calculated are compared with the measured spectra. The calculated frequencies and the force constants used are presented in the following table. In spite of the approximate nature of the structural unit and calculations, the agreement between the observed and calculated frequencies is very good. Force constants, in dynescm are Ge-O bond stretching force constant k sub r 395,000 O-Ge-O angle bending force constant k sub alpha 17,000 Ge-O-Ge angle bending force constant k sub beta 2,400. Author
- Ceramics, Refractories and Glass
- Atomic and Molecular Physics and Spectroscopy