Crystallographic and electronic evolution of lanthanum strontium ferrite (La0.6Sr0.4FeO3-δ) thin film and bulk model systems during iron exsolution

Götsch, Thomas; Köpfle, Norbert; Grünbacher, Matthias; Bernardi, Johannes; Carbonio, Emilia A.; Hävecker, Michael; Knop-Gericke, Axel; Bekheet, Maged F.; Schlicker, Lukas; Doran, Andrew; Gurlo, Aleksander; Franz, Alexandra; Klötzer, Bernhard; Penner, Simon

doi:10.1039/c8cp07743f

Crystallographic and electronic evolution of lanthanum strontium ferrite (La_0.6Sr_0.4FeO_3-δ) thin film and bulk model systems during iron exsolution

Journal Article · Tue Jan 15 04:00:00 EST 2019 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c8cp07743f· OSTI ID:1656498

^[1]; Köpfle, Norbert ^[2]; Grünbacher, Matthias ^[2]; Bernardi, Johannes ^[3]; ^[4]; Hävecker, Michael ^[5]; Knop-Gericke, Axel ^[5]; ^[6]; ^[6]; ^[7]; ^[6]; Franz, Alexandra ^[8]; Klötzer, Bernhard ^[2]; ^[2]

Univ. Innsbruck (Austria); Max Planck Inst. for Chemical Energy Conversion, Mülheim an der Ruhr (Germany); Fritz-Haber Inst. of the Max Planck Society, Berlin (Germany)
Univ. Innsbruck (Austria)
University Service Center for Transmission Electron Microscopy, Vienna (Austria)
Fritz-Haber Inst. of the Max Planck Society, Berlin (Germany); Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
Max Planck Inst. for Chemical Energy Conversion, Mülheim an der Ruhr (Germany); Fritz-Haber Inst. of the Max Planck Society, Berlin (Germany)
Technische Univ. Berlin (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy

In this work, we study the changes in the crystallographic phases and in the chemical states during the iron exsolution process of lanthanum strontium ferrite (LSF, La_0.6Sr_0.4FeO_3-δ). By using thin films of orthorhombic LSF, grown epitaxially on NaCl(001) and rhombohedral LSF powder, the materials gap is bridged. Furthermore, the orthorhombic material transforms into a fluorite structure after the exsolution has begun, which further hinders this process. Additionally, for the powder material, by a combination of in situ core level spectroscopy and ex situ neutron diffraction, we could directly highlight differences in the Fe chemical nature between surface and bulk: whereas the bulk contains Fe(IV) in the fully oxidized state, the surface spectra can be described perfectly by the sole presence of Fe(III). We also present corresponding magnetic and oxygen vacancy concentration data of reduced rhombohedral LSF that did not undergo a phase transformation to the cubic perovskite system based on neutron diffraction data.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES), Scientific User Facilities Division; Austrian Science Fund (FWF); Horizon 2020

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1656498

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 7 Vol. 21; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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