A combination of large unipolar electrostrain and d 33in a non-ergodic relaxor ferroelectric

Upadhyay, A and Kumar, N and Adhikary, GD and Singh, RP and Mishra, A and Ranjan, R (2022) A combination of large unipolar electrostrain and d 33in a non-ergodic relaxor ferroelectric. In: Journal of Applied Physics, 132 (20).

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Abstract

One of the important requirements for piezoelectric materials for use as high strain actuators is that they exhibit large unipolar electrostrain with minimum hysteresis. While large unipolar electrostrain >1% is generally achievable in good quality single crystals, most polycrystalline piezoelectric show low values < 0.4%. Unipolar electrostrain 0.5%-0.7% in polycrystalline piezoelectrics has often been reported in Na0.5Bi0.5TiO3-based compositions at the non-ergodic ergodic boundary. Not amenable to poling, such materials exhibit almost nearly zero direct piezoelectric coefficient (d33 ∼0 pC/N) and cannot be simultaneously used as a sensor. In this paper, we report a combination of large unipolar electrostrain of ∼0.6% with small strain hysteresis of 25% in a Sn-modified relaxor ferroelectric system PbTiO3-Bi(Ni1/2Zr1/2)O3. It exhibits d33 ∼340 pC/N, which is stable up to 130 °C, and large signal converse piezoelectric coefficient d33∗ ∼1200 pm/V. A combination of large d33 and d33∗ in the same material makes it an important candidate for simultaneous use as a sensor and high strain actuators. X-ray diffraction study in situ with the electric field suggests that large electrostrain with low strain hysteresis in this system is because of the increased reversible switching of the field stabilized tetragonal ferroelastic domains. © 2022 Author(s).

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright for this article belongs to American Institute of Physics Inc.
Keywords:	Ferroelectric materials; Ferroelectricity; Lead titanate; Piezoelectric actuators; Piezoelectricity; Single crystals, D 33; Electrostrain; Ergodics; High strain actuators; Na0.5Bi0.5TiO3; Piezoelectric; Piezoelectric coefficient; Polycrystalline; Relaxor ferroelectric; Strain hysteresis, Hysteresis
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Jan 2023 06:30
Last Modified:	25 Jan 2023 06:30
URI:	https://eprints.iisc.ac.in/id/eprint/79492

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