Synthesis of nanoparticles of the giant dielectric material, CaCu3Ti4O12 from a precursor route

Thomas, P and Dwarakanath, K and Varma, KBR and Kutty, TRN (2009) Synthesis of nanoparticles of the giant dielectric material, CaCu3Ti4O12 from a precursor route. In: Journal Of Thermal Analysis And Calorimetry, 95 (1). pp. 267-272.

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Abstract

A complex oxalate precursor, CaCu3(TiO)(4)(C2O4)(8)center dot 9H(2)O, (CCT-OX), was synthesized and the precipitate that obtained was confirmed to be monophasic by the wet chemical analyses, X-ray diffraction, FTIR absorption and TG/DTA analyses. The thermal decomposition of this oxalate precursor led to the formation of phase-pure calcium copper titanate, CaCu3Ti4O12, (CCTO) at a parts per thousand yen680A degrees C. The bright-field TEM micrographs revealed that the size of the as synthesized crystallites to be in the 30-80 nm range. The powders so obtained had excellent sinterability resulting in high density ceramics which exhibited giant dielectric constants upto 40000 (1 kHz) at 25A degrees C, accompanied by low dielectric losses.

Item Type:	Journal Article
Additional Information:	copyright of this article Belongs to Springer.
Keywords:	CaCu3Ti4O12;FTIR;giant dielectrics;precursor;TG;X-ray
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	03 Jan 2010 09:50
Last Modified:	19 Sep 2010 05:30
URI:	http://eprints.iisc.ernet.in/id/eprint/19797

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