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Polarization dynamics variation across the temperature- and composition-driven phase transitions in the lead-free Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 ferroelectrics

Zhukov, Sergey and Acosta, Matias and Genenko, Yuri A. and von Seggern, Heinz (2015):
Polarization dynamics variation across the temperature- and composition-driven phase transitions in the lead-free Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 ferroelectrics.
In: Journal of Applied Physics, pp. 134104(1, 118, (13), ISSN 0021-8979,
[Online-Edition: http://dx.doi.org/10.1063/1.4932641],
[Article]

Abstract

The method of thermally stimulated depolarization currents (TSDC) and polarization switching experiments over a large field, time, and temperature regime are used to refine the controversial phase diagram of Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 and comprehend its relation to ferroelectric and piezoelectric properties. TSDC results suggest the existence of three ferroelectric phases for the composition range of 0.30 ≤ x ≤ 0.60, which can be assigned to the rhombohedral (R), presumably orthorhombic (O), and tetragonal (T) symmetries. Spontaneous polarization is maximal all over the entire intermediate phase region, where the activation barrier for polarization switching is small, not just at R-O or O-T boundaries as might be deduced from previous observations.

Item Type: Article
Erschienen: 2015
Creators: Zhukov, Sergey and Acosta, Matias and Genenko, Yuri A. and von Seggern, Heinz
Title: Polarization dynamics variation across the temperature- and composition-driven phase transitions in the lead-free Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 ferroelectrics
Language: English
Abstract:

The method of thermally stimulated depolarization currents (TSDC) and polarization switching experiments over a large field, time, and temperature regime are used to refine the controversial phase diagram of Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3 and comprehend its relation to ferroelectric and piezoelectric properties. TSDC results suggest the existence of three ferroelectric phases for the composition range of 0.30 ≤ x ≤ 0.60, which can be assigned to the rhombohedral (R), presumably orthorhombic (O), and tetragonal (T) symmetries. Spontaneous polarization is maximal all over the entire intermediate phase region, where the activation barrier for polarization switching is small, not just at R-O or O-T boundaries as might be deduced from previous observations.

Journal or Publication Title: Journal of Applied Physics
Volume: 118
Number: 13
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 20 Oct 2015 08:15
Official URL: http://dx.doi.org/10.1063/1.4932641
Identification Number: doi:10.1063/1.4932641
Funders: Authors gratefully acknowledge the financial support of the Deutsche Forschungsgemeinschaft through the grants GE 1171/7-1 and SE 941/17-1. This work was also partially supported by the Leibniz program under RO954/22-1.
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