11B NMR Spectroscopy of Lead Borate Glasses: Additive Effect of Cerium Oxide - New Journal of Glass and Ceramics

NJGC > Vol.6 No.4, October 2016

New Journal of Glass and Ceramics

Volume 6, Issue 4 (October 2016)

ISSN Print: 2161-7554 ISSN Online: 2161-7562

Google-based Impact Factor: 0.73 Citations

¹¹B NMR Spectroscopy of Lead Borate Glasses: Additive Effect of Cerium Oxide ()

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DOI: 10.4236/njgc.2016.64007 1,678 Downloads 2,907 Views Citations

Author(s)

Gomaa El-Damrawi¹, Fawzia Gharghar¹, Rawia Ramadan², Mohamed Aboelez³

Affiliation(s)

¹Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
²Microwave and Dielectric Department, Physics Division, National Research Centre, Giza, Egypt.
³Faculty of Engineering, Monofya University, Sheben Elkom, Egypt.

ABSTRACT

Glasses and glass ceramics in the system xCeO_2·(50 - x)PbO·50B₂O₃ (0 ≤ x ≤ 50) have been studied, for the first time, by NMR and FTIR techniques. Effect of CeO₂ substitution with PbO on NMR parameters has been discussed in terms of changing both boron and cerium coordination. The quantitative fraction of four coordinated boron (N₄) has been simply determined from ¹¹B NMR spectroscopy. On the other hand, the fraction of total tetrahedral structural units B₄ (BO₄ + PbO₄ + CeO₄) is obtained from FTIR spectral analysis. It is not possible to get the fraction of cerium oxide directly from the applied spectroscopic tools. Therefore, a simple approach is applied, for the first time, to determine CeO₄ fraction by using the different criteria of both ¹¹B NMR and FTIR spectroscopy. The fraction of B₄ species is equal to N₄, within the experimental error, of the same glasses in the composition region of up to 10 mol% CeO₂. On the other hand, there is a clear difference between both N₄ and B₄ values in glasses of higher CeO₂content (>10 mol%). The related difference showed a linear increasing trend with increasing the content of CeO₂ in the glass. This was discussed on the bases of structural role of CeO₂ which acts as a glass former in the region >10 mol%, while, at lower concentration, it consumed as a glass modifier.

KEYWORDS

New Approach, Cerium Oxide, Boron Fraction

Share and Cite:

El-Damrawi, G. , Gharghar, F. , Ramadan, R. and Aboelez, M. (2016) ¹¹B NMR Spectroscopy of Lead Borate Glasses: Additive Effect of Cerium Oxide. New Journal of Glass and Ceramics, 6, 57-63. doi: 10.4236/njgc.2016.64007.

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