Factors influencing the coupling between non-180 degrees domain switching and lattice strain in perovskite piezoceramics

Kumar, Naveen and Khatua, Dipak Kumar and Mahale, Bhoopesh and Ranjan, Rajeev (2018) Factors influencing the coupling between non-180 degrees domain switching and lattice strain in perovskite piezoceramics. In: PHYSICAL REVIEW B, 97 (13).

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Abstract

Domain switching and lattice strain are known to be important processes contributing to the large electromechanical response observed in perovskite-based piezoelectrics. However, there is a lack of clarity regarding the coupling between the two phenomena, and the factors which influence this coupling. Here, we report a systematic investigation to understand the factors influencing the coupling between domain switching and lattice strain in perovskite piezoelectrics by x-ray diffraction in situ with electric field. In a slight departure from the conventional approach, we employ a strategy which enables x-ray diffraction study in situ with electric field on randomly oriented piezoelectric grains in their unclamped (free) state. Experiments were carried out on two different systems (1-x)PbTiO3-(x)BiScO3 and (1-x)PbTiO3-(x)PbZrO3 in their rhombohedral phase. We found that lattice strain along the nonpolar < 100 >(R) rhombohedral direction varies linearly with the non-180 degrees domain switching fraction (eta(111)). We introduce a parameter beta to characterize the strength of coupling between the two phenomena and show that the coupling is enhanced when the system approaches the morphotropic phase boundary. We also demonstrate that the grain-to-grain interaction nearly doubles this coupling in a dense piezoelectric ceramic.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Additional Information:	Copy right for this article belong to AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	08 May 2018 19:03
Last Modified:	08 May 2018 19:03
URI:	http://eprints.iisc.ac.in/id/eprint/59822

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