Medium range order in lead borophosphate glasses

Author： Koudelka L.   Mošner P.   Jirák J.   Zeyer-Düsterer M.   Jäger C.  

Publisher： Society of Glass Technology

ISSN： 0031-9090

Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.47, Iss.4, 2006-08, pp. : 471-475

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Abstract

The structure of 50PbO–xB2O3–(50−x)P2O5 glasses with x=0–25 mol% B2O3 was refined by Raman and 11B MQMAS NMR. The analysis of Raman spectra, using the concentration step of 2 mol% B2O3 within the range of 0–12 mol% B2O3, showed that the evolution of changes in the type of oxygen bridges can be observed from the Raman bands within the range of 600–800 cm−1. 11B MQMAS NMR spectra of glasses with x=15, 20 and 25 mol% B2O3 revealed the presence of two BO4 sites in these glasses. The first site B1O4, characterised by the chemical shift of δ=−3·8 — (−3·4) ppm, was assigned to tetrahedral B(OP)4 structural units. Within the concentration range x=15–25 mol% B2O3, the site B1O4 is gradually replaced by the site B2O4 with the chemical shift of δ=−1·8 — (−1·1) ppm. This second site was assigned to the presence of B(OP)3(OB) units in which the central boron atom is linked to three PO4 groups and one BO3 group.

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