Influence of silver ion concentration on dielectric characteristics of Li2O-Nb2O5-P2O5 glasses

• Published in: Journal of alloys and compounds 2019-01, Vol.773, p.654-665
• Main Authors: Prasad, V., Pavić, L., Moguš-Milanković, A., Siva Sesha Reddy, A., Gandhi, Y., Ravi Kumar, V., Naga Raju, G., Veeraiah, N.
• Format: Article
• Language: English
• Subjects: Dielectric properties; Li2O-Nb2O5-P2O5 glasses; Silver ions; Surface plasmon resonance
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.09.161

In this work we have studied the dielectric properties of Li2O-Nb2O5-P2O5: Ag2O glasses as a function of Ag2O concentration. Auxiliary studies viz., optical absorption, photoluminescence (PL), XPS and IR spectra have also been performed on these glasses. IR spectral studies have indicated that the host glass network doped with 1.0 mol% of Ag2O is highly polymerized. Optical absorption and PL studies have clearly exhibited absorption and emission bands due to surface plasmon resonance (SPR). From these studies, the presence of Ag0 -Ag+ clusters is established in the glass network and the concentration of such clusters is found to be the highest in the glass doped with 1.0 mol% of Ag2O. Finally, we have performed extensive studies on dielectric properties viz., dielectric constant, loss, electric moduli, impedance spectra and a.c. conductivity over broad ranges of frequency (0.01 Hz–1 MHz) and temperature (303–513 K). The glasses doped with higher content of Ag2O exhibited higher values of dielectric constant especially at lower frequencies and higher temperatures. The larger contribution from space charge polarization is predicted to be responsible for such higher values. In the glasses doped with low contents of Ag2O (