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Structure and conductivity of epitaxial thin films of barium ferrite and its hydrated form BaFeO2.5−x+δ (OH)2x

Sukkurji, Parvathy Anitha ; Molinari, Alan ; Benes, Alexander ; Loho, Christoph ; Chakravadhanula, Venkata Sai Kiran ; Garlapati, Suresh Kumar ; Kruk, Robert ; Clemens, Oliver (2017)
Structure and conductivity of epitaxial thin films of barium ferrite and its hydrated form BaFeO2.5−x+δ (OH)2x.
In: Journal of Physics D: Applied Physics, 50 (11)
doi: 10.1088/1361-6463/aa5718
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Barium ferrite and its hydrated form (BaFeO2.5−x+δ (OH)2x , BFO) is an interesting cathode material for protonic ceramic fuel cells (PCFC) due to its potential to be both, conducting for electrons and protons. We report on the fabrication of almost epitaxially grown thin films (22 nm) of barium ferrite BaFeO~2.5 (BFO) on Nb-doped SrTiO3 substrates via pulsed laser deposition (PLD), followed by treatment under inert, and subsequently wet inert atmospheres to induce water (respectively proton) incorporation. Microstructure, chemical composition and conducting properties are investigated for the BFO films and their hydrated forms, highlighting the influence of hydration on the conductivity characteristics between ~200–290 K. We find that water incorporation gives a strong enhancement of the conductivity to ~10−9 S cm−1 compared to argon annealed films, inducing electronic and protonic charge carriers at the same time. In comparison to bulk powders, proton conductivity is found to be strongly suppressed in such thin hydrated BFO films, pointing towards the influence of strain on the conductivity, which is evaluated based on a detailed investigation by high-resolution transmission electron microscopy.

Typ des Eintrags: Artikel
Erschienen: 2017
Autor(en): Sukkurji, Parvathy Anitha ; Molinari, Alan ; Benes, Alexander ; Loho, Christoph ; Chakravadhanula, Venkata Sai Kiran ; Garlapati, Suresh Kumar ; Kruk, Robert ; Clemens, Oliver
Art des Eintrags: Bibliographie
Titel: Structure and conductivity of epitaxial thin films of barium ferrite and its hydrated form BaFeO2.5−x+δ (OH)2x
Sprache: Englisch
Publikationsjahr: 14 Februar 2017
Verlag: IOP Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Physics D: Applied Physics
Jahrgang/Volume einer Zeitschrift: 50
(Heft-)Nummer: 11
DOI: 10.1088/1361-6463/aa5718
Kurzbeschreibung (Abstract):

Barium ferrite and its hydrated form (BaFeO2.5−x+δ (OH)2x , BFO) is an interesting cathode material for protonic ceramic fuel cells (PCFC) due to its potential to be both, conducting for electrons and protons. We report on the fabrication of almost epitaxially grown thin films (22 nm) of barium ferrite BaFeO~2.5 (BFO) on Nb-doped SrTiO3 substrates via pulsed laser deposition (PLD), followed by treatment under inert, and subsequently wet inert atmospheres to induce water (respectively proton) incorporation. Microstructure, chemical composition and conducting properties are investigated for the BFO films and their hydrated forms, highlighting the influence of hydration on the conductivity characteristics between ~200–290 K. We find that water incorporation gives a strong enhancement of the conductivity to ~10−9 S cm−1 compared to argon annealed films, inducing electronic and protonic charge carriers at the same time. In comparison to bulk powders, proton conductivity is found to be strongly suppressed in such thin hydrated BFO films, pointing towards the influence of strain on the conductivity, which is evaluated based on a detailed investigation by high-resolution transmission electron microscopy.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialdesign durch Synthese
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien
Hinterlegungsdatum: 22 Mär 2017 09:54
Letzte Änderung: 03 Jun 2018 21:28
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