More Insight on Structure of New Binary Cerium Borate Glasses - New Journal of Glass and Ceramics

NJGC > Vol.8 No.1, January 2018

New Journal of Glass and Ceramics

Volume 8, Issue 1 (January 2018)

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

Google-based Impact Factor: 1.75 Citations

More Insight on Structure of New Binary Cerium Borate Glasses ()

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DOI: 10.4236/njgc.2018.81002 1,126 Downloads 2,618 Views Citations

Author(s)

Gomaa El-Damrawi¹, Fawzeya Gharghar¹, Rawya Ramadan²

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.

ABSTRACT

The structure of glasses in the system of xCeO₂(100 - x)B₂O₃, x = 30, 40, 50 mol% CeO₂ has been explored for the first time by correlation between data obtained from XRD, FTIR and ¹¹B NMR analyses. NMR spectroscopy andFTIR spectroscopy have confirmed that transformation rate of BO₃ to BO₄ groups is reduced by CeO₂ addition.The concentration of Ce₄-O-Ce₄ is increased at the expense of both B₄-O-Ce₄ and B₃-O-B₄ linkages. Boron atoms are mainly coordinated with Ce₄ sites as second neighbors due to increasing CeO₄ species with further increase of CeO₂ concentration. Increasing B₄ fraction is considered due to forming of CeO₄ with rate higher than that of BO₄ units. The change of chemical shift of ¹¹B nuclei upon exchanging B₂O₃ with CeO₂ confirms that the central boron atoms would be coordinated with tetrahedral cerium atoms as second neighbors. The X-ray diffraction of cerium rich glass is clearly indicated that the formation of crystalline phases refers to CeO₄, CeBO₃and Ce(BO₂)₃ species.

KEYWORDS

Borate, Cerium, Former Units, NMR Analysis

Share and Cite:

El-Damrawi, G. , Gharghar, F. and Ramadan, R. (2018) More Insight on Structure of New Binary Cerium Borate Glasses. New Journal of Glass and Ceramics, 8, 12-21. doi: 10.4236/njgc.2018.81002.

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