Tiwari, Rajender Prasad and Shah, Jyoti and Kotnala, Ravinder Kumar and Birajdar, Balaji (2018) Electrical microstructure properties of 0.9(KNbO3)-0.1 (BaNi1/2Nb1/2O3-(delta)) electroceramic. Journal of Alloys and Compounds, 753. pp. 642-645. ISSN 0925-8388

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Abstract

The electroceramic of 0 9(KNb0(3)) - 0 1 (BaNi1/2Nb1/2O3_(delta)) (KBNNO) is synthesized using solid state reaction and its electrical microstructure properties are investigated using impedance spectroscopy. KBNNO exhibits negative temperature coefficient of resistance of - 0.283 degrees C-1 at 400 degrees C and the grain boundaries dominate its electrical properties. The conductivity is found to increase with the onset of ferroelectric to paraelectric phase transition. The possible underlying mechanism responsible for increase of conductivity with the onset of phase transition is discussed. The activation energy of conductivity is calculated to be 0.61 eV, indicating proton ion conduction in this electroceramic and the conduction mechanism can be described by using large polaron model. Present study suggests that KBNNO could be a prospective material for many noble applications such as solid oxide fuel cell, hydrogen sensing, and negative temperature coefficient thermistor for temperature compensation and temperature sensor etc.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Chemistry > Physical Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	29 Nov 2019 10:42
Last Modified:	29 Nov 2019 10:42
URI:	http://npl.csircentral.net/id/eprint/3890

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