Dielectric and electrical studies of Pr3+ doped nano CaSiO3 perovskite ceramics

Kulkarni, Sandhya and Nagabhushana, BM and Parvatikar, Narsimha and Koppalkar, Anilkumar and Shivakumara, C and Damle, R (2014) Dielectric and electrical studies of Pr3+ doped nano CaSiO3 perovskite ceramics. In: MATERIALS RESEARCH BULLETIN, 50 . pp. 197-202.

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Abstract

CaSiO3 nano-ceramic powder doped with Pr3+ has been prepared by solution combustion method. The powder Ca0.5Pr0.05SiO3 is investigated for its dielectric and electrical properties at room temperature to study the effect of doping. The sample is characterized by X-ray diffraction and infrared spectroscopy. The size of either of volume elements of CaSiO3:Pr3+ estimated from transmission electron microscopy is about 180-200 nm. The sample shows colossal dielectric response at room temperature. This colossal dielectric behaviour follows Debye-type relaxation and can be explained by Maxwell-Wagner (MW) polarization. However, analysis of impedance and electric modulus data using Cole-Cole plot shows that it deviates from ideal Debye behaviour resulting from the distribution of relaxation times. The distribution in the relaxation times may be attributed to existence of electrically heterogeneous grains, insulating grain boundary, and electrode contact regions. Doping, thus, results in substantial modifications in the dielectric and electrical properties of the nano-ceramic CaSiO3. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS RESEARCH BULLETIN
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords:	Nanoceramics; Perovskites; Dielectric properties; Electric modulus; AC conductivity
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Apr 2014 05:34
Last Modified:	22 Apr 2014 05:34
URI:	http://eprints.iisc.ac.in/id/eprint/48870

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