Medium range order in lead borophosphate glasses

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In this Subject: <a title="Inorganic Chemistry" href="/content/subcat?j_subject=167&j_availability=">Inorganic Chemistry
By this author: Koudelka, L. ;&nbsp; Mo&#353;ner, P. ;&nbsp; Jir&#225;k, J. ;&nbsp; Zeyer-D&#252;sterer, M. ;&nbsp; J&#228;ger, C.

Authors: Koudelka, L.; Mošner, P.; Jirák, J.; Zeyer-Düsterer, M.; Jäger, C.

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Volume 47, Number 4, August 2006 , pp. 471-475(5)

Publisher: Society of Glass Technology

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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.

Document Type: Research article

Publication date: 2006-08-01