1 August 1991 High-temperature Raman spectra of nioboborate glass melts
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Proceedings Volume 1513, Glasses for Optoelectronics II; (1991) https://doi.org/10.1117/12.46031
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands
This paper describes the structure of glass melts in the Nb2O5-B2O3-K2O system by high-temperature Raman spectra. Because the authors had adopted a special high- temperature heating apparatus in our experimental work, the Raman spectra of the glass melts can be directly measured in the high-temperature state. The experimental results indicate that the groups of (NbO6)and (NbO4) will replace (BO3) and (BO4) and compose a new structural network by introducing Nb2O5 into boric glass. The (NbO4) belongs to the Td group; it has two IR activity modes and four Raman activity modes. The Nb in the structure is SP3 hybridized orbital and also has one residual electron; it belongs to the (NbO4) and forms a large (pi) bond. Under the influence of the heating field, the (pi) bond is very easy deformed. The Raman matrix element of (NbO4) in the 870 cm-1 is zero, but the dipole transition matrix element is comparatively stable. This shows that the structure skeleton does not collapse. The (NbO6) belongs to the Oh group; it loses Oh group symmetry in the high-temperature state, so the new scattering peaks appear. This research is very useful for the study and production of a new series of optical glasses. Through this work, the structural model of nioboborate glass melts had been established.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Quanzu Yang, Quanzu Yang, Zhongcai Wang, Zhongcai Wang, Shizhuo Wang, Shizhuo Wang, } "High-temperature Raman spectra of nioboborate glass melts", Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991); doi: 10.1117/12.46031; https://doi.org/10.1117/12.46031

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