Kumar, Ranjit and Zulfequar, M. and Singh, V. N. and Singh, Sukhvir and Senguttuvan, T. D. (2012) A Low-Cost Chemical Route for High Dielectric Constant Plate-Shaped Nanocrystalline CaCu3Ti4O12. Advanced Science Letters , 5 (1). pp. 1-5. ISSN 1936-7317

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Abstract

Nanocrystalline CaCu3Ti4O12 (CCTO) dielectric ceramics were prepared by a low-cost sol–gel technique. Sols were aged for 48, 72, 96 and 120 hours at constant humidity. The samples were calcined at 700 �C and sintered at 1025 �C. XRD patterns revealed the formation of cubic perovskite CaCu3Ti4O12, with traces of CuO. HRTEM images showed interfacial spacing of 0.22 nm and 0.18 nm; corresponding to (222) and (400) planes of the body-centered cubic perovskite structure, respectively. Selected area electron diffraction (SAED) patterns indicated the presence of polycrystalline CCTO. SEM micrograph revealed that the grains are compacted and having a plate-like structure. Frequency and temperature dependence of dielectric constant and losses were also studied. I–V characteristics changed from nonlinear to linear for the sol aged for 120 hours. EDX spectra showed an increase in oxygen content with increase in sol ageing time. The presence of CuO and oxygen ion may be the cause of increased dielectric constant for samples aged for longer time.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Scientific Publishers.
Subjects:	Nanoscience/ Nanotechnology Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	17 Nov 2017 07:28
Last Modified:	17 Nov 2017 07:28
URI:	http://npl.csircentral.net/id/eprint/2229

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