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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
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Steiner, Sebastian ; Heldt, Jonas ; Sobol, Oded ; Unger, Wolfgang ; Frömling, Till
Art des Eintrags: Bibliographie
Titel: Influence of oxygen vacancies on core-shell formation in solid solutions of (Na,Bi)TiO3 and SrTiO3
Sprache: Englisch
Publikationsjahr: 8 April 2021
Verlag: Wiley
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Jahrgang/Volume einer Zeitschrift: 104
(Heft-)Nummer: 9
DOI: 10.1111/jace.17845
URL / URN: https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.17...
Kurzbeschreibung (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.

Freie Schlagworte: bismuth titanates, core-shell structures, diffusion/diffusivity, ferroelectricity/ferroelectric materials, lead-free ceramics
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 07 Jul 2021 06:09
Letzte Änderung: 07 Jul 2021 06:09
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