Abstract
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.
Highlights
Borate glasses containing CeO2 and PbO are used in wide field of applications
It is not possible to get the fraction of cerium oxide directly from the applied spectroscopic tools
It was concluded that glass and glass ceramics containing high concentration from PbO are of great importance from the viewpoint of glass formation
Summary
Borate glasses containing CeO2 and PbO are used in wide field of applications. This may be due to their distinction features including wide glass forming region and low thermal expansion [1]-[4]. Further increase of PbO content decreases the number of BO4 units by forming nonbridging oxygen atoms in glass network. In such situation Pb ions are mainly surrounded by two BO4 tetrahedral units and in part by BO3 units with NBOs [11]. The structure of CeO2-PbO-B2O3 glasses is investigated by means of FTIR absorbance and NMR techniques with an aim to determine the structure role of cerium in ternary cerium lead borate glasses. In this regard, there is a remarkable lack and shortage information about the role of ceria in glass ceramics
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