Dielectric Dispersion in PbO-Bi2O3-B2O3 Glasses Mixed with TiO2

Authors : P Venkateswara RAO, M Srinivasa REDDY, V Ravi KUMAR

Pages : 341-356

Doi:10.3906/zoo-1302-45

View : 17 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :[insert ignore into journalissuearticles values(PbO);0.20-x . insert ignore into journalissuearticles values(Bi2O3);0.40 . insert ignore into journalissuearticles values(B2O3);0.40]: insert ignore into journalissuearticles values(TiO2);x, 0.0 =< x =< 0.02 glasses were prepared. Dielectric properties insert ignore into journalissuearticles values(dielectric constant \varepsilon \prime, loss tan d and a.c. conductivity sac, over a wide range of frequency and temperature);, optical absorption, ESR and IR spectra of these glass materials have been investigated. The dielectric study has revealed that the glasses possess high insulating strength when TiO2 concentration is >0.8 mol% in the glass matrix. The optical absorption spectra of these glasses exhibited bands due to Ti3+ ions in the visible region. ESR spectral studies have also indicated that a fraction of Ti4+ ions reduced to Ti3+ ions. IR spectra of these glasses exhibited bands due to TiO4 and TiO6 structural units. Quantitative studies indicate that as concentration of TiO2 is increased to 0.8 mol% in the glass matrix, a large proportion of titanium ions exist in Ti3+ state and has influenced the physical properties of these glasses to a substantial extent.
Keywords : Turk J Phys, 32, 2008, 341 356 Turk J Phys, vol 32, iss 6