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Kolotygin VA, Tsipis EV, Markov AA, Patrakeev MV, Waerenborgh JC, Shaula AL, Kharton VV. Transport and Electrochemical Properties of SrFe(Al,Mo)O3–δ. RUSS J ELECTROCHEM+ 2018. [DOI: 10.1134/s1023193518060083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yamamoto T, Ohkubo H, Tassel C, Hayashi N, Kawasaki S, Okada T, Yagi T, Hester J, Avdeev M, Kobayashi Y, Kageyama H. Impact of Lanthanoid Substitution on the Structural and Physical Properties of an Infinite-Layer Iron Oxide. Inorg Chem 2016; 55:12093-12099. [PMID: 27801587 DOI: 10.1021/acs.inorgchem.6b02513] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of lanthanoid (Ln = Nd, Sm, Ho) substitution on the structural and physical properties of the infinite-layer iron oxide SrFeO2 was investigated by X-ray diffraction (XRD) at ambient and high pressure, neutron diffraction, and 57Fe Mössbauer spectroscopy. Ln for Sr substituted samples up to ∼30% were synthesized by topochemical reduction using CaH2. While the introduction of the smaller Ln3+ ion reduces the a axis as expected, we found an unusual expansion of the c axis as well as the volume. Rietveld refinements along with pair distribution function analysis revealed the incorporation of oxygen atoms between FeO2 layers with a charge-compensated composition of (Sr1-xLnx)FeO2+x/2, which accounts for the failed electron doping to the FeO2 layer. The incorporated partial apical oxygen or the pyramidal coordination induces incoherent buckling of the FeO2 sheet, leading to a significant reduction of the Néel temperature. High-pressure XRD experiments for (Sr0.75Ho0.25)FeO2.125 suggest a possible stabilization of an intermediate spin state in comparison with SrFeO2, revealing a certain contribution of the in-plane Fe-O distance to the pressure-induced transition.
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Affiliation(s)
- Takafumi Yamamoto
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Ohkubo
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.,The Hakubi Center for Advanced Research, Kyoto University , Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8302, Japan
| | - Naoaki Hayashi
- Micro/Nano Fabrication Hub, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University , Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan
| | - Shota Kawasaki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Taku Okada
- Research Institute for Solid State Physics, University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takehiko Yagi
- Research Institute for Solid State Physics, University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - James Hester
- Australian Synchrotron Research Program, Australian Nuclear Science and Technology Organisation , PMB 1, Menai, New South Wales 2234, Australia
| | - Maxim Avdeev
- Australian Synchrotron Research Program, Australian Nuclear Science and Technology Organisation , PMB 1, Menai, New South Wales 2234, Australia
| | - Yoji Kobayashi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.,CREST, Japan Science and Technology Agency (JST) , Kawaguchi, Saitama 332-0012, Japan
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Belenkaya I, Matvienko A, Nemudry A. Ferroelasticity of SrCo0.8Fe0.2O3–δperovskite-related oxide with mixed ion–electron conductivity. J Appl Crystallogr 2015. [DOI: 10.1107/s1600576714027770] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A group-theoretical analysis was carried out to determine the possible orientation states of domains formed as a result of the `perovskite–brownmillerite' phase transition in SrCo0.8Fe0.2O2.5oxide with mixed ion–electron conductivity (MIEC). The results of the theoretical analysis agree with the experimental data obtained in the study of the SrCo0.8Fe0.2O2.5microstructure by means of transmission electron microscopy. Brownmillerite SrCo0.8Fe0.2O2.5(BM) has a lamellar texture composed of 90° twins 60–260 nm in size; the 〈010〉BMand 〈101〉BMdirections are linked through twinning in accordance with the predictions of the group-theoretical analysis. The presence of twins and their switching under mechanical load provide evidence that the perovskite–brownmillerite phase transition in SrCo0.8Fe0.2O2.5is ferroelastic. Comparative analysis of the phenomena observed for ferroelectrics and MIEC oxides indicates their similarity based on the common nature of ferroelectricity and ferroelasticity, and allows us to suppose that nonstoichiometric SrCo0.8Fe0.2O3−δwith compositional disorder may be considered (in terms of its microstructural features) a `relaxor ferroelastic'.
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Biendicho J, Shafeie S, Frenck L, Gavrilova D, Böhme S, Bettanini A, Svedlindh P, Hull S, Zhao Z, Istomin S, Grins J, Svensson G. Synthesis and characterization of perovskite-type SrxY1−xFeO3−δ (0.63≤x<1.0) and Sr0.75Y0.25Fe1−yMyO3−δ (M=Cr, Mn, Ni), (y=0.2, 0.33, 0.5). J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pissas M, Kallias G, Poulakis N, Niarchos D, Simopoulos A, Liarokapis E. Structural, Mössbauer, and Raman studies of the (Y,Ce)2Sr2Cu2FeO8+y compound. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:10610-10620. [PMID: 9980114 DOI: 10.1103/physrevb.52.10610] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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