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  Charge Transfer and Structural Anomaly in Stoichiometric Layered Perovskite Sr2Co0.5Ir0.5O4

Mikhailova, D., Hu, Z., Kuo, C.-Y., Oswald, S., Mogare, K. M., Agrestini, S., et al. (2017). Charge Transfer and Structural Anomaly in Stoichiometric Layered Perovskite Sr2Co0.5Ir0.5O4. European Journal of Inorganic Chemistry, 2017(3), 587-595. doi:10.1002/ejic.201600970.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-B34D-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-01C3-1
Genre: Journal Article

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Mikhailova, Daria1, Author              
Hu, Zhiwei2, Author              
Kuo, Chang-Yang3, Author              
Oswald, Steffen4, Author
Mogare, Kailash M.5, Author              
Agrestini, Stefano6, Author              
Lee, Jyh-Fu4, Author
Pao, Chin-Wen4, Author
Chen, Shin-An4, Author
Lee, Jenn-Min4, Author
Haw, Shu-Chih4, Author
Chen, Jin-Ming4, Author
Liao, Yen-Fa4, Author
Ishii, Hirofumi4, Author
Tsuei, Ku-Ding4, Author
Senyshyn, Anatoliy4, Author
Ehrenberg, Helmut4, Author
Affiliations:
1Daria Mikhailova, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863448              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
4External Organizations, ou_persistent22              
5Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
6Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              

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 Abstract: A layered Sr2Co0.5Ir0.5O4 (space group I4/mmm) perovskite of the K2NiF4 structure type was synthesized as a single-phase sample. Neutron powder diffraction measurements revealed full site occupancy of oxygen atoms. The Co3+/Ir5+ valence states were evaluated by a combination of X-ray absorption and X-ray photoemission spectroscopy as well as by magnetization measurements, and thus the differences to the parent compounds Sr2CoO4 and Sr2IrO4 with similar structures were confirmed. Co-K edge EXAFS studies indicated a long average Co-O distance of 1.967 A suggestina high-spin state of the Co3+ ion in Sr2Co0.5Ir0.5O4. No long-range magnetic ordering down to 4 K was detected by neutron powder diffraction, probably hindered by the random distribution of Co and Ir cations in the Sr2Co0.5Ir0.5O4 structure. High-pressure synchrotron powder diffraction studies showed stability of the Sr2Co0.5Ir0.5O4 structure up to at least 27 GPa at room temperature. A maximum in the c/a ratio at 10 GPa together with an anomaly in the pressure dependence of the unit-cell volume could be a sign of a change in the spin state of the Co ions under pressure.

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Language(s): eng - English
 Dates: 2017-01-242017-01-24
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000393405500008
DOI: 10.1002/ejic.201600970
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Title: European Journal of Inorganic Chemistry
  Other : Eur. J. Inorg. Chem.
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley-VCH
Pages: - Volume / Issue: 2017 (3) Sequence Number: - Start / End Page: 587 - 595 Identifier: ISSN: 1434-1948
CoNE: /journals/resource/954926953810_1