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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.

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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

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