Structural Role of PbO in Li2O–PbO–B2O3 Glasses

Thermal and spectroscopic studies have been carried out on a number of glasses with wide ranging compositions in the pseudoternary glass system Li2O–PbO–B2O3 in order to understand the structural role of PbO in these glasses. Infrared, Raman, and 11B MAS-NMR results indicate that PbO behaves as a ne...

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Bibliographic Details
Published in:Journal of solid state chemistry 1999-06, Vol.145 (1), p.65-76
Main Authors: Ganguli, Munia, Rao, K.J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
glass spectra
Glasses
lead glasses
Physics
structural role of lead
Structure of solids and liquids
crystallography
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Summary:Thermal and spectroscopic studies have been carried out on a number of glasses with wide ranging compositions in the pseudoternary glass system Li2O–PbO–B2O3 in order to understand the structural role of PbO in these glasses. Infrared, Raman, and 11B MAS-NMR results indicate that PbO behaves as a network former in these glasses and is possibly incorporated in the network as [PbO4/2]2− units. The formation of [PbO4/2]2− units leads to the creation of neutral three-coordinated boron (B03) which, in turn, leads to the reformation of four-coordinated boron (B−4) in the structure at the expense of two-coordinated (B−2) and singly coordinated (B2−1) boron atoms. The variations of glass transition temperatures (Tg) and molar volumes also support this model.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1999.8221