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Glass - Back to the Future!

Presenting Author:
Armenak Osipov

article posted 06 April 2016

Armenak Osipov is a head of the Laboratory of Experimental Mineralogy and Physics of Minerals at the Institute of Mineralogy of UB RAS. His PhD was awarded in 2002 for research in the structure of silicate glasses and melts at the South Ural State University. Armenak and his wife Leyla are currently focused on the structural study of oxide glasses and melts.

Raman spectroscopic study of Fe-containing ZnO-B2O3 glasses

Armenak A. Osipov*, Rimma T. Zainullina, Leyla M. Osipova
Institute of Mineralogy of UB RAS, Miass, 456317, Russian Federation

The goal of this work was to study the effect of Fe2O3 on structure of the binary ZnO-B2O3 glasses. Series of Fe-containing zinc borate glasses with general chemical formula Fe2O3-(100-x)[yZnO-(100-y)B2O3] (x = 0, 0.1, 0.3, 0.5 ,0.7 and 0.9 mol%; y = 40, 45, 50 ,55 mol%) were prepared by a melt quenching technique. Raman spectroscopy technique was used to study the glass structures as a function of their composition. Analysis of the spectra (Fig. 1) has shown that all known trigonal boron species (B3, B2O-, BO22- and BO33-) as well as [B4]- tetrahedra coexist in structure of Fe-free binary glasses and their concentration varies systematically as the ZnO content changes from 40 to 55 mol%.

Fig. 1. Raman spectra of Fe-free ZnO-B2O3 glasses.

Fig. 2. Photographs of xFe2O3-(100-x)[yZnO-(100-y)B2O3] glasses.

Addition of even small amount of Fe2O3 leads to the dyeing of glasses: the color of the Fe-containing glasses varies from light yellow to brown with increasing Fe2O3 content (Fig. 2). All Raman bands quickly degrade with increasing color saturation. Examples of Raman spectra of 50Z glasses (xFe2O3-(100-x) [50ZnO-50B2O3]) are shown in Fig. 3. The normalized Raman spectra (Fig. 3 (right)), however, show that the intensity of the bands located in the 750-900 cm-1 range is reduced most strongly. This indicates that addition of the Fe2O3 to the binary ZnO-BO3 glasses prevent from the formation of any superstructural groups with well defined arrangements of basic structural units.

Fig. 3. Initial (left) and normalized (right) Raman spectra of xFe2O3-(100-x)[50ZnO-50B2O3] glasses