Glasses
and glass ceramics in the system xCeO2·(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 CeO2 content (>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.
References
[1]
Gautam, C., Yadav, A.K. and Singh, A.K. (2012) A Review on Infrared Spectroscopy of Borate Glasses with Effects of Different Additives. ISRN Ceramics, 2012, Article ID: 428497.
http://dx.doi.org/10.5402/2012/428497
[2]
Wadate, Y., Hattori, T., Nishiyama, S., Fukushima, K., Igawa, N. and Noda, K. (1996) Short-Range Structural Analysis of an Oxide Glass Composed of Light and Heavy Elements: 3B2O3-2PbO Glass by X-Ray Diffraction. Journal of Material Science Letters, 15, 776-780.
http://dx.doi.org/10.1007/BF00274601
[3]
El-Damrawi, G. and El-Egili, K. (2001) Characterization of Novel CeO2-B2O3 Glasses, Structure and Properties. Physica B, 299, 180-186.
http://dx.doi.org/10.1016/S0921-4526(00)00593-7
[4]
Singh, G.P., Kaur, P., Kaur, S.P. and Singh, D.P. (2012) Conversion of Covalent to Ionic Character of V2O5-CeO2-PbO-B2O3 Glasses for Solid State Ionic Devices. Physica B, 407, 4269-4273.
http://dx.doi.org/10.1016/j.physb.2012.07.015
[5]
Terashima, K., Hashimoto, T. and Yoko, T. (1997) Structure and Nonlinear Optical Properties of PbO-Bi2O3-B2O3 Glasses. Physics and Chemistry of Glasses, 38, 211-217.
[6]
Mao, D. and Bray, P.J. (1992) 11B NQR and NMR Studies of Lead Borates. Journal of Non-Crystalline Solids, 144, 217-223.
http://dx.doi.org/10.1016/S0022-3093(05)80403-X
[7]
Doweidar, H., El-Damrawi, G., Mansour, E. and Fetouh, R.E. (2012) Structural Role of MgO and PbO in MgO-PbO-B2O3 Glasses as Revealed by FTIR; a New Approach. Journal of Non-Crystalline Solids, 358, 941-946.
Doweidar, H., Gohar, I.A., Megahed, A.A. and El-Damrawi, G. (1991) Structure-Transport Relationships in Lead Borate Glasses Containing V2O5. Solid State Ionics, 46, 275-281.
http://dx.doi.org/10.1016/0167-2738(91)90226-2
[9]
Takaishi, T., Jin, J., Uchino, T. and Yoko, T. (2000) Structural Study of PbO-B2O3 Glasses by X-Ray Diffraction and 11B MAS NMR Techniques. Journal of the American Ceramic Society, 83, 2543-2548.
Doweidar, H., El-Igili, K. and Abd El-Maksoud, S. (2000) Correlations between Properties and Structure in CuO-PbO-B2O3 Glasses. Journal of Physics D: Applied Physics, 33, 2532- 2537.
[11]
Saini, A., Khanna, A., Michaelis, V.K., Kroeker, S., Gonzalez, F. and Hernandez, D. (2009) Structure-Property Correlations in Lead Borate and Borosilicate Glasses Dopped with Aluminum Oxide. Journal of Non-Crystalline Solids, 355, 2323-2332.
Kroeker, S. and. Stebbins, J.F. (2001) Three-Coordinated Boron-11 Chemical Shifts in Borates. Inorganic Chemistry, 40, 6239-6246.
http://dx.doi.org/10.1021/ic010305u
[13]
Aguiar, P.M. and Kroeker, S. (2005) Medium-Range Order in Cesium Borate Glasses. Solid State Nuclear Magnetic Resonance, 27, 10-15.
http://dx.doi.org/10.1016/j.ssnmr.2004.08.009
[14]
Singh, G.P., Kaur, P., Kaur, S.P., Kaur, R. and Singh, D.P. (2013) Conversion of Ce+3 to Ce+4 Ions after Gamma Ray Irradiation on CeO2-PbO-B2O3 Glasses. Physica B, 408, 115-118.
http://dx.doi.org/10.1016/j.physb.2012.09.005
[15]
Culea, E., Pop, L. and Bosca, M. (2010) Structural and Physical Characteristics of CeO2- GeO2-PbO Glasses and Glass Ceramics. Journal of Alloys and Compounds, 505, 754-757.
http://dx.doi.org/10.1016/j.jallcom.2010.06.135
[16]
Marzouk, S.Y. and Ezz-Eldin, F.M. (2008) Optical study of Ce3+ Ion in Gamma-Irradiated Binary Barium-Borate Glasses. Physica B, 403, 3307-3315.
http://dx.doi.org/10.1016/j.physb.2008.04.041
[17]
Kutub, A.A., Elmanharawy, M.S. and Shawoosh, A.S. (1996) Optical Proprties of Irradiated Sodium Diaborate Glasses Containing Copper and Cerium. Physica Status Solidi (A), 155, 239-248.
http://dx.doi.org/10.1002/pssa.2211550124
[18]
El-Damrawi, G., Gharghar, F. and Ramadan, R. (2016) Structural Studies on New CeO2·(50-x)PbO·50B2O3 Glasses and Glass Ceramics. Journal of Non Crystalline Solids, 452, 291-296.
