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Treading in the Limited Stability Regime of Lanthanum Strontium Ferrite — Reduction, Phase Change and Exsolution

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Götsch,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
University of Innsbruck, Department of Physical Chemistry;
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Carbonio,  Emilia
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Helmholtz-Zentrum Berlin für Materialien und Energie, Catalysis for Energy;

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Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Götsch, T., Köpfle, N., Schlicker, L., Carbonio, E., Hävecker, M., Knop-Gericke, A., et al. (2019). Treading in the Limited Stability Regime of Lanthanum Strontium Ferrite — Reduction, Phase Change and Exsolution. ECS Transactions, 91(1), 1771-1781. doi:10.1149/09101.1771ecst.


Cite as: http://hdl.handle.net/21.11116/0000-0004-9A8A-3
Abstract
We present an in situ investigation of the iron exsolution from lanthanum strontium ferrite perovskites. Using in situ X-ray diffraction experiments at the synchrotron, the exact onset of exsolution was determined by a change in the lattice parameter before any iron reflexes become visible. For an initially orthorhombic thin film, on the other hand, a phase transition to a fluorite/rock-salt structure is observed to occur during the exsolution. Also, a difference in the iron oxidation states between bulk and surface is found since photoelectron spectroscopy and X-ray absorption spectroscopy both indicate the existence of the Fe(III)/Fe(II) couple in oxidation/reduction cycles, whereas magnetic measurements would suggest Fe(IV)/Fe(III).