Structural role of PbO in Li2O-PbO-B2O3 glasses

Ganguli, Munia ; Rao, K. J. (1999) Structural role of PbO in Li2O-PbO-B2O3 glasses Journal of Solid State Chemistry, 145 (1). pp. 65-76. ISSN 0022-4596

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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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Lead Glasses; Glass Spectra; Structural Role of Lead
ID Code:43766
Deposited On:16 Jun 2011 06:15
Last Modified:16 Jun 2011 06:15

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