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Enhanced performance of ferroelectric materials under hydrostatic pressure

Chauhan, Aditya and Patel, Satyanarayan and Wang, Shuai and Novak, Nikola and Xu, Bai-Xiang and Lv, Peng and Vaish, Rahul and Lynch, Christopher S. (2017):
Enhanced performance of ferroelectric materials under hydrostatic pressure.
In: Journal of Applied Physics, pp. 1-8, ISSN 00218979, DOI: 10.1063/1.5003775, [Online-Edition: https://doi.org/10.1063/1.5003775],
[Article]

Abstract

Mechanical confinement or restricted degrees of freedom have been explored for its potential to enhance the performance of ferroelectric devices. It presents an easy and reversible method to tune the response for specific applications. However, such studies have been mainly limited to uni- or biaxial stress. This study investigates the effect of hydrostatic pressure on the ferroelectric behavior of bulk polycrystalline Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3. Polarization versus electric field hysteresis plots were generated as a function of hydrostatic pressure for a range of operating temperatures (298–398 K). The application of hydrostatic pressure was observed to induce anti-ferroelectric like double hysteresis loops. This in turn enhances the piezoelectric, energy storage, energy harvesting, and electrocaloric effects. The hydrostatic piezoelectric coefficient (dh) was increased from 50pCN^-1 (0MPa) to ~900 pC N^-1 (265 MPa) and ~3200 pCN^-1 (330MPa) at 298K. Energy storage density was observed to improve by more than 4 times under pressure, in the whole temperature range. The relative change in entropy was also observed to shift from ~0 to 4.8 J kg^-1K^-1 under an applied pressure of 325MPa. This behavior can be attributed to the evolution of pinched hysteresis loops that have been explained using a phenomenological model. All values represent an improvementof several hundred percent compared to unbiased performance, indicating the potential benefits of the proposed methodology. Published by AIP Publishing

Item Type: Article
Erschienen: 2017
Creators: Chauhan, Aditya and Patel, Satyanarayan and Wang, Shuai and Novak, Nikola and Xu, Bai-Xiang and Lv, Peng and Vaish, Rahul and Lynch, Christopher S.
Title: Enhanced performance of ferroelectric materials under hydrostatic pressure
Language: English
Abstract:

Mechanical confinement or restricted degrees of freedom have been explored for its potential to enhance the performance of ferroelectric devices. It presents an easy and reversible method to tune the response for specific applications. However, such studies have been mainly limited to uni- or biaxial stress. This study investigates the effect of hydrostatic pressure on the ferroelectric behavior of bulk polycrystalline Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3. Polarization versus electric field hysteresis plots were generated as a function of hydrostatic pressure for a range of operating temperatures (298–398 K). The application of hydrostatic pressure was observed to induce anti-ferroelectric like double hysteresis loops. This in turn enhances the piezoelectric, energy storage, energy harvesting, and electrocaloric effects. The hydrostatic piezoelectric coefficient (dh) was increased from 50pCN^-1 (0MPa) to ~900 pC N^-1 (265 MPa) and ~3200 pCN^-1 (330MPa) at 298K. Energy storage density was observed to improve by more than 4 times under pressure, in the whole temperature range. The relative change in entropy was also observed to shift from ~0 to 4.8 J kg^-1K^-1 under an applied pressure of 325MPa. This behavior can be attributed to the evolution of pinched hysteresis loops that have been explained using a phenomenological model. All values represent an improvementof several hundred percent compared to unbiased performance, indicating the potential benefits of the proposed methodology. Published by AIP Publishing

Journal or Publication Title: Journal of Applied Physics
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 03 Jan 2018 08:01
DOI: 10.1063/1.5003775
Official URL: https://doi.org/10.1063/1.5003775
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