Abstract
Fourier-transform infrared (FTIR) absorption and Raman spectra of germanate glasses are presented together with spectra of crystalline materials in the system K 2O-(Fe 2O 3)-Al 2O 3(Ga 2O 3)-GeO 2. The vibrational modes observed in the high- and mid-wavenumber regions of the spectra are interpreted in terms of symmetrical and antisymmetrical stretching and bending motions of GeO 4 tetrahedra. The influence of composition of the measured glasses is discussed, as well as the impact of the effect of heat treatment on their structure. The molecular structure of germanate glasses is deduced from comparison of the Raman and FTIR spectra of the glasses with the spectra of crystalline materials obtained by crystallization of considered glasses. The phase composition of samples undergoing crystallization was confirmed with X-ray diffractography. The changes observed in the vibrational spectra of potassium aluminogermanate glasses during the crystallization process are found to be analogous to those observed in the spectra of gallogermanates.
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