Kumar, Ranjit and Zulfequar, M. and Senguttuvan, T. D. (2015) Dielectric properties of microwave flash combustion derived and spark plasma sintered CaCu3Ti4O12 ceramic: role of reduction in grain boundary activation energy. Journal of Materials Science: Materials in Electronics, 26 (9). pp. 6718-6722. ISSN 0957-4522

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CaCu3Ti4O12 nanocrystals have been synthesized by the microwave flash combustion technique. The calcined powders were spark plasma sintered at 1050 degrees C for 10 min. The surface morphology of sintered samples was studied by SEM. The effects of grain boundary activation energy on dielectric properties of CCTO were investigated by collecting the dielectric data in the frequencies of 30 Hz-8 MHz at temperatures of 20-100 degrees C under dc bias of 0-6 V. The potential energy barrier at grain boundary has been examined by dc bias experiments. It is observed that, with an increase in dc bias from 0 to 6 V, the grain boundary activation energy decreases from 0.532 to 0.463 eV. The reduction in such grain boundary activation energy results in the decrease in dielectric constant. It is noticed that CCTO ceramic at room temperature under zero dc bias has a colossal dielectric constant of 20,000 (at 100 Hz). Using the cole-cole plot, grain and grain boundary resistance are calculated to be 13 and 52,100 Omega, respectively.

Item Type: Article
Subjects: Engineering > Electronics and Electrical Engineering
Materials Science
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 21 Sep 2016 11:35
Last Modified: 21 Sep 2016 11:35
URI: http://npl.csircentral.net/id/eprint/1768

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