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  Oxygen deficiency in Sr2FeO4-x: electrochemical control and impact on magnetic properties

Adler, P., Schröder, L., Teske, K., Reehuis, M., Hoser, A., Merz, P., et al. (2022). Oxygen deficiency in Sr2FeO4-x: electrochemical control and impact on magnetic properties. Physical Chemistry Chemical Physics, 1-14. doi:10.1039/d2cp02156k.

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 Creators:
Adler, Peter1, Author           
Schröder, Liane2, Author           
Teske, Klaus2, Author
Reehuis, Manfred3, Author
Hoser, Andreas3, Author
Merz, Patrick2, Author           
Schnelle, Walter4, Author           
Felser, Claudia5, Author           
Jansen, Martin2, Author           
Affiliations:
1Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863435              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3External Organizations, ou_persistent22              
4Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The oxygen-deficient system Sr2FeO4-x was explored by heating the stoichiometric Fe4+ oxide Sr2FeO4 in well-defined oxygen partial pressures which were controlled electrochemically by solid-state electrolyte coulometry. Samples with x up to about 0.2 were obtained by this route. X-ray diffraction analysis reveals that the K2NiF4-type crystal structure (space group I4/mmm) of the parent compound is retained. The lattice parameter a slightly decreases while the c-parameter increases with increasing x, which is in contrast to the Ruddlesden-Popper system Sr3Fe2O7-x and suggests removal of oxygen atoms from FeO2 lattice planes. The magnetic properties were studied by magnetization, Fe-57 Mossbauer, and powder neutron diffraction experiments. The results suggest that extraction of oxygen atoms from the lattice progressively changes the elliptical spiral spin ordering of the parent compound to an inhomogeneous magnetic state with coexistence of long-range ordered regions adopting a circular spin spiral and smaller magnetic clusters.

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Language(s): eng - English
 Dates: 2022-06-292022-06-29
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000821142600001
DOI: 10.1039/d2cp02156k
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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 14 Identifier: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1