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https://doi.org/10.1016/s0022-3093(98)00470-0
Copy DOIJournal: Journal of Non-Crystalline Solids | Publication Date: Jul 1, 1998 |
Citations: 107 |
Binary lead silicate glasses have been investigated using 207Pb and 29Si high resolution solid state Nuclear Magnetic Resonance (NMR) spectroscopy. From these experiments we have evidenced that lead forms covalent PbO 4 and PbO 3 pyramids over a large compositional range. The distribution of the Q n silicate species is determined. The calculated equilibrium constant of the reactions 2 Q n=Q n+1 + Q n−1 are 1 order of magnitude larger than those determined for alkali silicates. For both lead and silicon, there is a distribution of local environments. At larger lead contents, we observe the existence of a lead oxide based network. For <60 mol% PbO content, silicon is the main glass former. As the lead content increases, the silicate network is broken and the chains constituted of PbO n pyramids connect together.
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