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), pp. 4341-4350. Wiley, ISSN 0002-7820,
DOI: 10.1111/jace.17845,
[Article]
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 |
| Title: | Influence of oxygen vacancies on core-shell formation in solid solutions of (Na,Bi)TiO3 and SrTiO3 |
| Language: | English |
| 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. |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 104 |
| Issue Number: | 9 |
| Publisher: | Wiley |
| 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 |
| DOI: | 10.1111/jace.17845 |
| URL / URN: | https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17... |
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