Structural transformations in morphotropic-phase-boundary composition of the lead-free piezoelectric system Ba(Ti0.8Zr0.2)O-3 - (Ba0.7Ca0.3) TiO3

Brajesh, Kumar and Abebe, Mulualem and Ranjan, Rajeev (2016) Structural transformations in morphotropic-phase-boundary composition of the lead-free piezoelectric system Ba(Ti0.8Zr0.2)O-3 - (Ba0.7Ca0.3) TiO3. In: PHYSICAL REVIEW B, 94 (10).

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Abstract

The exceptionally large piezoelectric response of the morphotropic- phase-boundary (MPB) composition of the lead-free piezoelectric system (1 - x) Ba(Ti0.8Zr0.2)O-3 - x(Ba0.7Ca0.3) TiO3 has attracted great attention in recent years. Here in this paper we report a detailed investigation of the structural phase transformation behavior of the MPB composition (x = 0.50) driven by electric field, stress, and temperature. We show that the system exhibits metastable phases in a wide temperature range, and that the large piezoresponse at room temperature has a significant contribution from the increased fraction of the metastable phases induced by the poling field. Using a ``powder poling'' technique we also demonstrate the equivalence of stress and electric field with regard to the nature of the structural transformation. The fundamental significance of this interesting observation is discussed.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Oct 2016 09:48
Last Modified:	22 Oct 2016 09:48
URI:	http://eprints.iisc.ac.in/id/eprint/55077

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