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

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Abstract

A complex oxalate precursor, CaCu3(TiO)4(C2O4)8·9H2O, (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 ≥680°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 25°C, accompanied by low dielectric losses, <0.07.

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Authors and Affiliations

  1. Dielectric Materials Division, Central Power Research Institute, Bangalore, 560 080, India

    P. Thomas & K. Dwarakanath

  2. Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India

    P. Thomas, K. B. R. Varma & T. R. N. Kutty

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  1. P. Thomas
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  2. K. Dwarakanath
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  3. K. B. R. Varma
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  4. T. R. N. Kutty
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Correspondence to T. R. N. Kutty.

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Thomas, P., Dwarakanath, K., Varma, K.B.R. et al. Synthesis of nanoparticles of the giant dielectric material, CaCu3Ti4O12 from a precursor route. J Therm Anal Calorim 95, 267–272 (2009). https://doi.org/10.1007/s10973-007-8981-z

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  • DOI: https://doi.org/10.1007/s10973-007-8981-z

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