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The Ag2O/PbO ratio influence on 3B2O3-Ag2O-PbO glasses

I. ARDELEAN1,* , A. O. HULPUS1, R. CICEO LUCACEL1

Affiliation

  1. Faculty of Physics, Babes Bolyai University, Cluj Napoca, 400084, Romania

Abstract

Silver lead borate glasses were investigated through spectroscopic methods (FTIR absorption and Raman scattering) and X-ray diffraction in order to obtain information concerning the influence of the Ag2O/ PbO ratio on the short range order of network structure. The obtained diffraction patterns prove the vitreous character of these samples in the 0  y  1 compositional range. The FTIR data reveals a network structure mainly based on the di-, tri-, tetra-, penta- and orthoborate groups. The changes on the Ar (A4/A3) ratio, (where the values A4 and A3 reflect de relative amount of tetrahedral (BO4, BØ − 4 ) and triangular (BØ3 and BØ2O-) borate species) were also followed in order to understand the Ag2O/PbO relative amount influence on the boron atom coordination. For all analyzed samples, the amount of tricoordinated boron atoms is superior to tetracoordinated ones. A progressive increases of the tetracoordinated boron atoms versus tricoordinated ones up to y = 0.5 was observed. The Raman data is in agree with the structural information revealed by the FTIR spectroscopy and expose new structural groups such as pyroborate groups and boroxol rings..

Keywords

Silver-lead-borate glasses, FTIR, Raman.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

I. ARDELEAN, A. O. HULPUS, R. CICEO LUCACEL, The Ag2O/PbO ratio influence on 3B2O3-Ag2O-PbO glasses, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 751-755 (2007)