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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 and Molinari, Alan and Benes, Alexander and Loho, Christoph and Chakravadhanula, Venkata Sai Kiran and Garlapati, Suresh Kumar and Kruk, Robert and 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, IOP Publishing, p. 115302, 50, (11), ISSN 0022-3727,
[Online-Edition: http://doi.org/10.1088/1361-6463/aa5718],
[Article]

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.

Item Type: Article
Erschienen: 2017
Creators: Sukkurji, Parvathy Anitha and Molinari, Alan and Benes, Alexander and Loho, Christoph and Chakravadhanula, Venkata Sai Kiran and Garlapati, Suresh Kumar and Kruk, Robert and Clemens, Oliver
Title: Structure and conductivity of epitaxial thin films of barium ferrite and its hydrated form BaFeO2.5−x+δ (OH)2x
Language: English
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.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 50
Number: 11
Publisher: IOP Publishing
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 > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 22 Mar 2017 09:54
Official URL: http://doi.org/10.1088/1361-6463/aa5718
Identification Number: doi:10.1088/1361-6463/aa5718
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