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Abstract
Polarized Raman spectra of lanthanum borogermanate (LBG) glasses of different compositions, as well as of LBG glasses obtained by the hot-extrusion technique, have been obtained. In addition, the crystallization behaviour of LBG glasses of different compositions has been studied by differential thermal analysis and X-ray diffraction. Both the Raman spectra profile and the crystallization behaviour depend on the lanthanum–boron ratio. Polarized Raman spectra of hot-extruded samples show differences from the unextruded samples. For the first time, structural changes in glasses under hot-extrusion treatment were observed by vibrational spectroscopy.
Acknowledgements
This work was financially supported by NATO Science for Peace Programme (grant SfP-977980) and in part by the Russian Foundation for Basic Research (grant 02-03-32105). The authors would like to acknowledge Dr Ivan Gregora for fruitful discussions of Raman experiments.