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Quenching- circumvented ergodicity in relaxor Na1/2Bi1/2TiO3- BaTiO3- K0.5Na 0.5NbO3

Wei, Qiumei ; Riaz, Adeel ; Zhukov, Sergey ; Hofmann, Kathrin ; Zhu, Mankang ; Hou, Yudong ; Rödel, Jürgen ; Kodumudi Venkataraman, Lalitha (2021):
Quenching- circumvented ergodicity in relaxor Na1/2Bi1/2TiO3- BaTiO3- K0.5Na 0.5NbO3.
In: Journal of the American Ceramic Society, 104 (7), pp. 3316-3324. ISSN 0002-7820,
DOI: 10.1111/jace.17708,
[Article]

Abstract

Quenching alkaline bismuth titanates from sintering temperatures results in increased lattice distortion and consequently higher depolarization temperature. This work investigates the influence of quenching on the ergodicity of relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3. A distinct departure from ergodicity is evidenced from the increase in remanent polarization and the absence of frequency dispersion in the permittivity response of poled samples. Further, the samples exhibit enhanced negative strain upon application of electric field, indicating proclivity towards correlated polar nanoregions, corroborated by the enhanced tetragonal distortion. As a result, ergodic relaxor Na1/2Bi1/2TiO3-6BaTiO3- 3K0.5Na0.5NbO3 exhibits a depolarization temperature of 85°C with a 60% increase in remanent polarization and approximately a threefold increase in remanent strain upon quenching. Quenching-induced changes in the local environment of Na+ and Bi3+ cations hinder the development of ergodicity promoted by the A-site disorder. These results provide new insight into tailoring ergodicity of relaxor ferroelectrics.

Item Type: Article
Erschienen: 2021
Creators: Wei, Qiumei ; Riaz, Adeel ; Zhukov, Sergey ; Hofmann, Kathrin ; Zhu, Mankang ; Hou, Yudong ; Rödel, Jürgen ; Kodumudi Venkataraman, Lalitha
Title: Quenching- circumvented ergodicity in relaxor Na1/2Bi1/2TiO3- BaTiO3- K0.5Na 0.5NbO3
Language: English
Abstract:

Quenching alkaline bismuth titanates from sintering temperatures results in increased lattice distortion and consequently higher depolarization temperature. This work investigates the influence of quenching on the ergodicity of relaxor Na1/2Bi1/2TiO3-BaTiO3-K0.5Na0.5NbO3. A distinct departure from ergodicity is evidenced from the increase in remanent polarization and the absence of frequency dispersion in the permittivity response of poled samples. Further, the samples exhibit enhanced negative strain upon application of electric field, indicating proclivity towards correlated polar nanoregions, corroborated by the enhanced tetragonal distortion. As a result, ergodic relaxor Na1/2Bi1/2TiO3-6BaTiO3- 3K0.5Na0.5NbO3 exhibits a depolarization temperature of 85°C with a 60% increase in remanent polarization and approximately a threefold increase in remanent strain upon quenching. Quenching-induced changes in the local environment of Na+ and Bi3+ cations hinder the development of ergodicity promoted by the A-site disorder. These results provide new insight into tailoring ergodicity of relaxor ferroelectrics.

Journal or Publication Title: Journal of the American Ceramic Society
Journal volume: 104
Number: 7
Uncontrolled Keywords: ferroelectricity/ferroelectric materials, lead-free ceramics, relaxors
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 > Nonmetallic-Inorganic Materials
Date Deposited: 10 May 2021 06:18
DOI: 10.1111/jace.17708
Official URL: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17...
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