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Thermal depolarization and electromechanical hardening in Zn2+ -doped Na1/2Bi1/2TiO3-BaTiO3

Kodumudi Venkataraman, Lalitha ; Zhu, Tingting ; Salazar, Moinca Pinto ; Hofmann, Kathrin ; Waidha, Aamir Iqbal ; Jaud, J.-C. ; Groszewicz, Pedro B. ; Rödel, Jürgen (2021):
Thermal depolarization and electromechanical hardening in Zn2+ -doped Na1/2Bi1/2TiO3-BaTiO3.
In: Journal of the American Ceramic Society, 104 (5), pp. 2201-2212. ISSN 0002-7820,
DOI: 10.1111/jace.17581,
[Article]

Abstract

Na1/2Bi1/2TiO3-based materials have been earmarked for one of the first large-volume applications of lead-free piezoceramics in high-power ultrasonics. Zn2+-doping is demonstrated as a viable route to enhance the thermal depolarization temperature and electromechanically harden (1-y)Na1/2Bi1/2TiO3-yBaTiO3(NBT100yBT) with a maximum achievable operating temperature of 150 °C and mechanical quality factor of 627 for 1 mole % Zn2+-doped NBT6BT. Although quenching from sintering tempera-tures has been recently touted to enhance T F-R, with quenching the doped composi- tions featuring an additional increase in T F-R by 17 °C, it exhibits negligible effect on the electromechanical properties. The effect is rationalized considering the missing influence on conductivity and therefore, negligible changes in the defect chemistry upon quenching. High-resolution diffraction indicates that Zn 2+-doped samples favor the tetragonal phase with enhanced lattice distortion, further corroborated by 23Na Nuclear Magnetic Resonance investigations.

Item Type: Article
Erschienen: 2021
Creators: Kodumudi Venkataraman, Lalitha ; Zhu, Tingting ; Salazar, Moinca Pinto ; Hofmann, Kathrin ; Waidha, Aamir Iqbal ; Jaud, J.-C. ; Groszewicz, Pedro B. ; Rödel, Jürgen
Title: Thermal depolarization and electromechanical hardening in Zn2+ -doped Na1/2Bi1/2TiO3-BaTiO3
Language: English
Abstract:

Na1/2Bi1/2TiO3-based materials have been earmarked for one of the first large-volume applications of lead-free piezoceramics in high-power ultrasonics. Zn2+-doping is demonstrated as a viable route to enhance the thermal depolarization temperature and electromechanically harden (1-y)Na1/2Bi1/2TiO3-yBaTiO3(NBT100yBT) with a maximum achievable operating temperature of 150 °C and mechanical quality factor of 627 for 1 mole % Zn2+-doped NBT6BT. Although quenching from sintering tempera-tures has been recently touted to enhance T F-R, with quenching the doped composi- tions featuring an additional increase in T F-R by 17 °C, it exhibits negligible effect on the electromechanical properties. The effect is rationalized considering the missing influence on conductivity and therefore, negligible changes in the defect chemistry upon quenching. High-resolution diffraction indicates that Zn 2+-doped samples favor the tetragonal phase with enhanced lattice distortion, further corroborated by 23Na Nuclear Magnetic Resonance investigations.

Journal or Publication Title: Journal of the American Ceramic Society
Journal volume: 104
Number: 5
Uncontrolled Keywords: electromechanical hardening, Na0.5Bi0.5TiO3, quenching, thermal depolarization, Zn2+-doping
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: 03 Feb 2021 10:33
DOI: 10.1111/jace.17581
Additional Information:

First published online: 22 November 2020

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