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Electric field–temperature phase diagram of sodium bismuth titanate-based relaxor ferroelectrics

Weyland, Florian and Acosta, Matias and Vögler, Malte and Ehara, Yoshitaka and Rödel, Jürgen and Novak, Nikola (2018):
Electric field–temperature phase diagram of sodium bismuth titanate-based relaxor ferroelectrics.
In: Journal of Materials Science, Springer, pp. 9353-9400, 2018, (53), ISSN 0022-2461, DOI: 10.1007/s10853-018-2232-5, [Article]

Abstract

The electric field–temperature phase diagrams of three bismuth sodium titanatebased relaxor ferroelectrics are reported, namely 0.94(Na1/2Bi1/2TiO3)–0.06(BaTiO3), 0.80(Na1/2Bi1/2TiO3)–0.20(K1/2Bi1/2TiO3) and 0.75(Na1/2Bi1/2TiO3)–0.25(SrTiO3). Relaxor behavior is demonstrated by temperature-dependent dielectric permittivity measurements in the unpoled and poled states, as well as by the field-induced phase transition into a ferroelectric phase from the relaxor phase. From temperature-dependent thermometry measurements, we identified the threshold electric field to induce the ferroelectric phase and obtained the released latent heat of the phase transition. We determined the nonergodic and ergodic relaxor phase temperature range based on the absence or presence of reversibility of the relaxor to ferroelectric transition. For all three compositions, the electric field–temperature phase diagram was constructed and a critical point was identified. The constructed electric field–temperature phase diagrams are useful to find optimum operational ranges of ferroelectrics and relaxors for electromechanical and electrocaloric applications.

Item Type: Article
Erschienen: 2018
Creators: Weyland, Florian and Acosta, Matias and Vögler, Malte and Ehara, Yoshitaka and Rödel, Jürgen and Novak, Nikola
Title: Electric field–temperature phase diagram of sodium bismuth titanate-based relaxor ferroelectrics
Language: English
Abstract:

The electric field–temperature phase diagrams of three bismuth sodium titanatebased relaxor ferroelectrics are reported, namely 0.94(Na1/2Bi1/2TiO3)–0.06(BaTiO3), 0.80(Na1/2Bi1/2TiO3)–0.20(K1/2Bi1/2TiO3) and 0.75(Na1/2Bi1/2TiO3)–0.25(SrTiO3). Relaxor behavior is demonstrated by temperature-dependent dielectric permittivity measurements in the unpoled and poled states, as well as by the field-induced phase transition into a ferroelectric phase from the relaxor phase. From temperature-dependent thermometry measurements, we identified the threshold electric field to induce the ferroelectric phase and obtained the released latent heat of the phase transition. We determined the nonergodic and ergodic relaxor phase temperature range based on the absence or presence of reversibility of the relaxor to ferroelectric transition. For all three compositions, the electric field–temperature phase diagram was constructed and a critical point was identified. The constructed electric field–temperature phase diagrams are useful to find optimum operational ranges of ferroelectrics and relaxors for electromechanical and electrocaloric applications.

Journal or Publication Title: Journal of Materials Science
Volume: 2018
Number: 53
Publisher: Springer
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 20 Apr 2018 06:18
DOI: 10.1007/s10853-018-2232-5
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