Possible mechanism of charge transport and dielectric relaxation in SrO-Bi2O3-B2O3 glasses

Majhi, Koushik and Varma, KBR and Rao, KJ (2009) Possible mechanism of charge transport and dielectric relaxation in SrO-Bi2O3-B2O3 glasses. In: Journal of applied physics, 106 (8). 084106-1-084106-8.

PDF 4.pdf - Published Version Restricted to Registered users only Download (865kB) | Request a copy

Abstract

Transparent SrBi2B2O7 glasses were prepared via melt-quenching technique and characterized using differential scanning calorimetry and x-ray powder diffraction. The ac conductivities of the glasses were studied as a function of frequency (100 Hz-10 MHz) at different temperatures. The frequency dependence of conductivity has been analyzed using Almond-West expression. The exponent n was nearly unaffected by temperature. Impedance and modulus spectroscopies were employed to further examine the electrical data. Dielectric relaxation exhibited a stretched exponential behavior with a stretching exponent beta independent of temperature. From conductivity analysis we have proposed that the charge transport occurs through the participation of nonbridging oxygen (NBO), which switches positions in a facile manner. The stretched exponential behavior appears to be a direct consequence of the NBO switching mechanism of charge transport.

Item Type:	Journal Article
Publication:	Journal of applied physics
Publisher:	American Institute of physics
Additional Information:	Copyright for this article belongs to American Institute of physics.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	04 Dec 2009 08:41
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/24983

Actions (login required)

View Item