Room Temperature Magnetically Ordered Polar Corundum GaFeO3 Displaying Magnetoelectric Coupling

被引:37
|
作者
Niu, Hongjun [1 ]
Pitcher, Michael J. [1 ]
Corkett, Alex J. [1 ]
Ling, Sanliang [2 ]
Mandal, Pranab [1 ]
Zanella, Marco [1 ]
Dawson, Karl [3 ]
Stamenov, Plamen [4 ]
Batuk, Dmitry [5 ]
Abakumov, Artem M. [5 ,6 ]
Bull, Craig L. [7 ]
Smith, Ronald I. [7 ]
Murray, Claire A. [8 ]
Day, Sarah J. [8 ]
Slater, Ben [2 ]
Cora, Furio [2 ]
Claridge, John B. [1 ]
Rosseinsky, Matthew J. [1 ]
机构
[1] Univ Liverpool, Dept Chem, Crown St, Liverpool L69 7ZD, Merseyside, England
[2] UCL, Dept Chem, Gower St, London WC1E 6BT, England
[3] Univ Liverpool, Sch Engn, Ctr Mat & Struct, Liverpool L69 3GH, Merseyside, England
[4] Trinity Coll Dublin, CRANN, Dublin 2, Ireland
[5] Univ Antwerp, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
[6] Skolkovo Inst Sci & Technol, Skoltech Ctr Electrochem Energy Storage, Moscow 143026, Russia
[7] Rutherford Appleton Lab, ISIS Neutron & Muon Source, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England
[8] Diamond Light Source, Diamond House, Didcot OX11 0DE, Oxon, England
基金
俄罗斯科学基金会; 英国工程与自然科学研究理事会;
关键词
MULTIFERROICS; SYMMETRY; PHASE; OXIDE; PSEUDOPOTENTIALS; FERROELECTRICS; MAGNETIZATION; POLARIZATION; DIFFRACTION; PEROVSKITE;
D O I
10.1021/jacs.6b11128
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The polar corundum structure type offers a route to new room temperature multiferroic materials, as the partial LiNbO3-type cation ordering that breaks inversion symmetry may be combined with long-range magnetic ordering of high spin d(5) cations above room temperature in the AFeO(3) system. We report the synthesis of a polar corundum GaFeO3 by a high-pressure, high-temperature route and demonstrate that its polarity arises from partial LiNbO3 -type cation ordering by complementary use of neutron, X-ray, and electron diffraction methods. In situ neutron diffraction shows that the polar corundum forms directly from AlFeO3-type GaFeO3 under the synthesis conditions. The A(3+)/Fe3+ cations are shown to be more ordered in polar corundum GaFeO3 than in isostructural ScFeO3. This is explained by DFT calculations which indicate that the extent of ordering is dependent on the configurational entropy available to each system at the very different synthesis temperatures required to form their corundum structures. Polar corundum GaFeO3 exhibits weak ferromagnetism at room temperature that arises from its Fe2O3-like magnetic ordering, which persists to a temperature of 408 K. We demonstrate that the polarity and magnetization are coupled in this system with a measured linear magnetoelectric coupling coefficient of 0.057 ps/m. Such coupling is a prerequisite for potential applications of polar corundum materials in multiferroic/magnetoelectric devices.
引用
收藏
页码:1520 / 1531
页数:12
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