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Synergistic role of poling in enhancing structural heterogeneity in perovskite piezoelectrics

De, Arnab and Ranjan, Rajeev (2018) Synergistic role of poling in enhancing structural heterogeneity in perovskite piezoelectrics. In: PHYSICAL REVIEW B, 98 (9).

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Official URL: http://dx.doi.org/ 10.1103/PhysRevB.98.094111

Abstract

Local structural heterogeneity is known to enhance the piezoelectric response of perovskite-based ferroelectrics. Here we investigate how this heterogeneity is affected by strong electric fields using dilute doped Eu+3 ions as local structural probes. We make use of the extreme sensitivity of the D-5(0) -> F-7(2) hypersensitive transition of Eu+3 vis-a-vis the asymmetric distribution of the ligand field around the doped ion to demonstrate that a strong electric field (poling) increases the overall low-symmetry regions on the local length scale in a BaTiO3 -based lead-free piezoceramic near the P4mm-Amm2 polymorphic phase boundary (PPB). Our study suggests that the mandatory treatment of poling given to a ceramic to make it piezoactive also contributes to the microscopic mechanisms that improve the system's piezo-response.

Item Type: Journal Article
Additional Information: Copy right for this article belong to AMER PHYSICAL SOC
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 10 Oct 2018 15:16
Last Modified: 10 Oct 2018 15:16
URI: http://eprints.iisc.ac.in/id/eprint/60846

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