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Effect of calcium stoichiometry on the dielectric response of CaCu3Ti4O12 ceramics

Thomas, P and Dwarakanath, K and Varma, KBR. (2012) Effect of calcium stoichiometry on the dielectric response of CaCu3Ti4O12 ceramics. In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 32 (8). pp. 1681-1690.

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2011.12.0...

Abstract

CaxCu3Ti4O12 (x=0.90, 0.97, 1.0, 1.1 and 1.15) polycrystalline powders with variation in calcium content were prepared via the oxalate precursor route. The structural, morphological and dielectric properties of the ceramics fabricated using these powders were studied using X-ray diffraction, scanning electron microscope along with energy dispersive X-ray analysis, transmission electron microscopy, electron spin resonance (ESR) spectroscopy and impedance analyzer. The X-ray diffraction patterns obtained for the x = 0.97, 1.0 and 1.1 powdered ceramics could be indexed to a body-centered cubic perovskite related structure associated with the space group Im3. The ESR studies confirmed the absence of oxygen vacancies in the ceramics that were prepared using the oxalate precursor route. The dielectric properties of these suggest that the calcium deficient sample (x = 0.97) has a reduced dielectric loss while retaining the high dielectric constant which is of significant industrial relevance. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science
Keywords: Sintering;Grain boundary;Dielectric properties;CaCu3Ti4O12
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 22 Aug 2012 10:50
Last Modified: 22 Aug 2012 10:50
URI: http://eprints.iisc.ernet.in/id/eprint/44428

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