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Dielectric and Impedance Studies on 0.5Li(2)O-0.5K(2)O-2B(2)O(3) Glasses

Paramesh, G and Meher, Preethi KRS and Ahmed, Niyaz M and Varma, KBR (2010) Dielectric and Impedance Studies on 0.5Li(2)O-0.5K(2)O-2B(2)O(3) Glasses. In: Integrated Ferroelectrics, 118 . pp. 95-105.

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Abstract

Transparent glasses in the system 0.5Li(2)O-0.5K(2)O-2B(2)O(3) (LKBO) were fabricated via the conventional melt quenching technique. Amorphous and glassy nature of the samples was confirmed by X-ray diffraction and differential scanning calorimetry (DSC) respectively. Complex dielectric and impedance studies were conducted on the samples at different temperatures in the 100 Hz-10 MHz frequency range. ac conductivity was calculated from the dielectric data and the conductivity relaxation was found to obey the Jonscher's law. The Nyquist's plots (Z `'(omega) vs. Z'(omega)) showed single suppressed semicircles at all the temperatures under study indicating the non ideal Debye type relaxation process to be active. Activation energies for conduction and relaxation process were calculated using the Arrhenius relation. The UV-visible optical transmission spectra was shown a wide transmission window and calculated optical band gap was found to be 5.67 eV.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis Group
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 27 Dec 2010 07:45
Last Modified: 28 Dec 2010 06:57
URI: http://eprints.iisc.ernet.in/id/eprint/34606

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