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LiNbO3-Type InFeO3:...
LiNbO3-Type InFeO3: Room-Temperature Polar Magnet without Second-Order Jahn-Teller Active Ions
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- Fujita, K. (författare)
- Kyoto University
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- Kawamoto, T. (författare)
- Kyoto University
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- Yamada, I. (författare)
- Japan Science and Technology Agency (JST),Osaka Prefecture University
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- Hernandez, O. (författare)
- Université de Rennes 1,University of Rennes 1
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- Hayashi, N. (författare)
- Research Institute For Production Development
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- Akamatsu, H. (författare)
- Pennsylvania State University,Tokyo Institute of Technology
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- Lafargue-Dit-Hauret, W. (författare)
- Université de Rennes 1,University of Rennes 1
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- Rocquefelte, X. (författare)
- Université de Rennes 1,University of Rennes 1
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- Fukuzumi, M. (författare)
- Hyogo Prefectural Institute of Technology
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- Manuel, P. (författare)
- STFC Rutherford Appleton Laboratory
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- Studer, A. J. (författare)
- Australian Nuclear Science and Technology Organisation
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- Knee, Christopher, 1973 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tanaka, K. (författare)
- Kyoto University
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(creator_code:org_t)
- 2016-09-09
- 2016
- Engelska.
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 1520-5002 .- 0897-4756. ; 28:18, s. 6644-6655
- Relaterad länk:
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http://dx.doi.org/10...
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https://hal-univ-ren...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
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- Great effort has been devoted to developing single-phase magnetoelectric multiferroics, but room-temperature coexistence of large electric polarization and magnetic ordering still remains elusive. Our recent finding shows that such polar magnets can be synthesized in small-tolerance-factor perovskites AFeO(3) with unusually small cations at the A-sites, which are regarded as having a LiNbO3-type structure (space group R3c). Herein, we experimentally reinforce this finding by preparing a novel room-temperature polar magnet, LiNbO3-type InFeO3. This compound is obtained as a metastable quench product from an orthorhombic perovskite phase stabilized at 15 GPa and an elevated temperature. The structure analyses reveal that the polar structure is characterized by displacements of In3+ (d(10)) and Fe3+ (d(5)) ions along the hexagonal c-axis (pseudocubic [111] axis) from their centrosymmetric positions, in contrast to well-known perovskite ferroelectrics (e.g., BaTiO3, PbTiO3, and BiFeO3) where d(0) transition-metal ions and/or 6s(2) lone-pair cations undergo polar displacements through the so-called second-order Jahn-Teller (SOJT) distortions. Using density functional theory calculations, the electric polarization of LiNbO3-type InFeO3 is estimated to be 96 mu C/cm(2) along the c-axis, comparable to that of an isostructural and SOJT-active perovskite ferroelectric, BiFeO3 (90-100 mu C/cm(2)). Magnetic studies demonstrate weak ferromagnetic behavior at room temperature, as a result of the canted G-type antiferromagnetic ordering of Fe3+ moments below T-N similar to 545 K. The present work shows the functional versatility of small-tolerance-factor perovskites and provides a useful guide for the synthesis and design of room-temperature polar magnets.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
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Fujita, K.
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Kawamoto, T.
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Yamada, I.
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Hernandez, O.
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Hayashi, N.
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Akamatsu, H.
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Lafargue-Dit-Hau ...
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Rocquefelte, X.
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Fukuzumi, M.
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Manuel, P.
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Studer, A. J.
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Knee, Christophe ...
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Tanaka, K.
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