Kumar, Ranjit and Zulfequar, M. and Senguttuvan, T. D. (2019) Improved giant dielectric properties in microwave flash combustion derived and microwave sintered CaCu3Ti4O12 ceramics. Journal of Electroceramics, 42 (1-2). 41-46. ISSN 1385-3449

PDF - Published Version Restricted to Registered users only Download (1064Kb) | Request a copy

Abstract

The nanocrystals of CaCu3Ti4O12 ceramic were prepared by microwave flash combustion technique. The microwave sintering of powders was optimized to 1025 - 1075 degrees C for 20min with heating and cooling rate of 50 degrees C/min. Microstructural evaluation of sintered sample was carried out using SEM. The dielectric properties were measured in the frequency range 10-2x10(6)Hz and the temperature range 30-100 degrees C. The CCTO sample sintered at 1075 degrees C had giant dielectric constant 53,300 at 100Hz. It was observed that dielectric constant was greatly increased on a slight increase in sintering temperature. Modulus and impedance analysis were performed to explore the observed unusual dielectric response. Grain and grain boundary resistance were observed as 8 and 350,000 , respectively. The grain boundary activation energy for electro-conduction was calculated as 0.65eV by using the characteristic frequencies in cole-cole plots. It was noticed that the thermally activated charge carriers had long-range mobility.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Journal of Electroceramics
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	19 Aug 2026 11:20
Last Modified:	19 Aug 2026 11:20
URI:	https://npl.csircentral.net/id/eprint/4242

Actions (login required)

View Item