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Influence of oxygen vacancies on core-shell formation in solid solutions of (Na,Bi)TiO3 and SrTiO3

Steiner, Sebastian ; Heldt, Jonas ; Sobol, Oded ; Unger, Wolfgang ; Frömling, Till (2021)
Influence of oxygen vacancies on core-shell formation in solid solutions of (Na,Bi)TiO3 and SrTiO3.
In: Journal of the American Ceramic Society, 104 (9)
doi: 10.1111/jace.17845
Article, Bibliographie

Abstract

Solid solutions of (Na,Bi)TiO3 (NBT) and SrTiO3 (ST) are materials of interest for high-strain or high-energy density capacitor applications. Often, they exhibit chemical heterogeneity and develop core-shell structures during regular solid-state synthesis with an NBT-rich core. In this case, the NBT forms first so that the strontium needs to diffuse into the material to reach chemical homogeneity. Depending on the presence of core-shell structures, the electrical properties can vary drastically. In this work, we rationalize the effect of variations in oxygen vacancy concentration by Fe-acceptor and Nb-donor doping. It can be shown that a diffusion couple of strontium and oxygen is responsible for chemical homogenization and that the oxygen vacancy content can control the formation of a core-shell structure.

Item Type: Article
Erschienen: 2021
Creators: Steiner, Sebastian ; Heldt, Jonas ; Sobol, Oded ; Unger, Wolfgang ; Frömling, Till
Type of entry: Bibliographie
Title: Influence of oxygen vacancies on core-shell formation in solid solutions of (Na,Bi)TiO3 and SrTiO3
Language: English
Date: 8 April 2021
Publisher: Wiley
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 104
Issue Number: 9
DOI: 10.1111/jace.17845
URL / URN: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17...
Abstract:

Solid solutions of (Na,Bi)TiO3 (NBT) and SrTiO3 (ST) are materials of interest for high-strain or high-energy density capacitor applications. Often, they exhibit chemical heterogeneity and develop core-shell structures during regular solid-state synthesis with an NBT-rich core. In this case, the NBT forms first so that the strontium needs to diffuse into the material to reach chemical homogeneity. Depending on the presence of core-shell structures, the electrical properties can vary drastically. In this work, we rationalize the effect of variations in oxygen vacancy concentration by Fe-acceptor and Nb-donor doping. It can be shown that a diffusion couple of strontium and oxygen is responsible for chemical homogenization and that the oxygen vacancy content can control the formation of a core-shell structure.

Uncontrolled Keywords: bismuth titanates, core-shell structures, diffusion/diffusivity, ferroelectricity/ferroelectric materials, lead-free ceramics
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: 07 Jul 2021 06:09
Last Modified: 07 Jul 2021 06:09
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