Effect of A-site off-stoichiometry on the microstructural, structural, and electromechanical properties of lead-free tetragonal 0.80Na0.5Bi0.5TiO3�0.20BaTiO3 (NBT�20BT) piezoceramic

Mishra, A and Abebe, G and Jafo, G and Das Adhikary, G and De, A (2021) Effect of A-site off-stoichiometry on the microstructural, structural, and electromechanical properties of lead-free tetragonal 0.80Na0.5Bi0.5TiO3�0.20BaTiO3 (NBT�20BT) piezoceramic. In: Journal of Materials Science: Materials in Electronics, 32 (9). pp. 12578-12593.

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Abstract

A-site off-stoichiometry has been an efficient method to enhance the electromechanical properties of lead-free Na0.5Bi0.5TiO3(NBT)-based piezoceramics. In this work, we have reported the effect of Na/Bi off-stoichiometry on the microstructural, structural, and electromechanical properties of the tetragonal 0.80Na0.5Bi0.5TiO3�0.20BaTiO3 (NBT�20BT) ceramic. The maximum piezoresponse ~ 115 pC/N is obtained for 4 mol Na-deficient (20BT�Na46) and 2 mol Bi-excess (20BT�Bi52) compositions. It is a 25 increment over the piezoresponse of the stoichiometric composition (20BT�Na50 ~ 90 pC/N). The enhancement in piezoresponse has been attributed to an optimized presence of polar-structural heterogeneity/disorder in the poled ceramic matrix and an optimized distortion of the long-range tetragonal ferroelectric phase. It is established that A-site off-stoichiometry is influencing the polar-structural heterogeneity/disorder and tetragonal lattice distortion via the grain size. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Keywords:	Piezoelectric ceramics, Ceramic matrix; Electromechanical property; Ferroelectric phase; Micro-structural; Piezo-ceramics; Stoichiometric compositions; Structural heterogeneity; Tetragonal lattices, Stoichiometry
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Aug 2021 11:48
Last Modified:	17 Aug 2021 11:48
URI:	http://eprints.iisc.ac.in/id/eprint/69176

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