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Tiwari P, Gangwar D, Rath C. Studies on the structural, magnetic and electrochemical properties of GdMn 1−xFe xO 3 ( x = 0, 0.1 and 0.2) perovskite compounds. NEW J CHEM 2021. [DOI: 10.1039/d1nj02026a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tunable physical properties of the rare earth manganite GdMnO3 hold significant promise for different applications.
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Affiliation(s)
- Priyanka Tiwari
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi 221005
- India
| | - Deepti Gangwar
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi 221005
- India
| | - Chandana Rath
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi 221005
- India
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2
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Matsubara N, Masese T, Suard E, Forslund OK, Nocerino E, Palm R, Guguchia Z, Andreica D, Hardut A, Ishikado M, Papadopoulos K, Sassa Y, Månsson M. Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO 4. Inorg Chem 2020; 59:17970-17980. [PMID: 33264565 PMCID: PMC7759007 DOI: 10.1021/acs.inorgchem.0c02241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The crystal structure and magnetic properties of the cubic spinel MgFeMnO4 were studied by using a series of in-house techniques along with large-scale neutron diffraction and muon spin rotation spectroscopy in the temperature range between 1.5 and 500 K. The detailed crystal structure is successfully refined by using a cubic spinel structure described by the space group Fd3̅m. Cations within tetrahedral A and octahedral B sites of the spinel were found to be in a disordered state. The extracted fractional site occupancies confirm the presence of antisite defects, which are of importance for the electrochemical performance of MgFeMnO4 and related battery materials. Neutron diffraction and muon spin spectroscopy reveal a ferrimagnetic order below TC = 394.2 K, having a collinear spin arrangement with antiparallel spins at the A and B sites, respectively. Our findings provide new and improved understanding of the fundamental properties of the ferrispinel materials and of their potential applications within future spintronics and battery devices.
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Affiliation(s)
- Nami Matsubara
- Department of Applied Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Titus Masese
- Department of Energy and Environment, Research Institute of Electrochemical Energy (RIECEN), National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.,AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto 606-8501, Japan
| | - Emmanuelle Suard
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Cedex 9 Grenoble, France
| | - Ola Kenji Forslund
- Department of Applied Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Elisabetta Nocerino
- Department of Applied Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Rasmus Palm
- Department of Applied Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, PSI, Switzerland
| | - Daniel Andreica
- Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| | - Alexandra Hardut
- Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
| | - Motoyuki Ishikado
- Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | | | - Yasmine Sassa
- Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
| | - Martin Månsson
- Department of Applied Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
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3
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Pandey GC, Nemkovski K, Su Y, Rath C. Evidence of anomalous conventional and spontaneous exchange bias, high coercivity in Fe doped NiCr 2O 4 spinel. Dalton Trans 2020; 49:4502-4517. [PMID: 32193522 DOI: 10.1039/d0dt00124d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NiCr2-xFexO4 (x = 0 and 0.2) polycrystalline ceramics have been synthesized successfully through a simple co-precipitation technique to study the evolution of structural and magnetic properties by doping Fe. X-ray diffraction (XRD) reveals that the high-temperature cubic phase (space group Fd3[combining macron]m) observed at 320 K in bulk NiCr2O4 is stabilized at room temperature by decreasing the particle size to nanometer in x = 0 as well as after incorporating 20 at% Fe in the NiCr2O4 lattice. The cation distribution obtained from X-ray absorption fine structure (XAFS) analysis illustrates that while in x = 0, Ni2+ and Cr3+ ions occupy the tetrahedral (A) and octahedral (B) sites, respectively, x = 0.2, Fe3+ and Cr3+ ions occupy the A and B sites, respectively, and Ni2+ ions are distributed among the A and B sites. This transformation from the normal to mixed spinel structure strongly affects the magnetic properties. While the paramagnetic to long-range ferrimagnetic ordering temperature TC is enhanced from 71 to 192 K, significantly large coercive field (HC) of ∼29 kOe is observed for x = 0.2 as compared to the HC ∼13 kOe for x = 0. Moreover, unusually large conventional and spontaneous exchange bias fields of ∼26 and ∼2.6 kOe are observed for x = 0.2, which is absent for x = 0. The presence of anomalous exchange bias field is ascribed to the unidirectional exchange anisotropy between the two magnetic sublattices at A and B sites. The training effect of the exchange bias field is discussed using a phenomenological model, which considers the contribution from irreversible uncompensated spins that modify the exchange anisotropy at the interface between A and B magnetic sublattices. In addition, diffuse neutron scattering (DNS) with XYZ analysis is employed for both compositions to clearly illustrate the low-temperature peculiar magnetic phase transitions such as spin spiral transition, TS and spin lock-in transition, Tl. The DNS demonstrates that while Tl decreases from 10 K to 7 K with the incorporation of Fe in the NiCr2O4 lattice, TS significantly increases from 28 K to 50 K.
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Affiliation(s)
- G C Pandey
- School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India.
| | - K Nemkovski
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748 Garching, Germany
| | - Y Su
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748 Garching, Germany
| | - Chandana Rath
- School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India.
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Li C, Wang C, Lei Q, Barasa GO, Fu Q, Qiu Y. Effect of Fe substitution on structure and exchange interactions within and between the sublattices of frustrated CoCr2O4. Phys Chem Chem Phys 2020; 22:28222-28229. [DOI: 10.1039/d0cp04783j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Obtaining tunable magnetic states in geometrically frustrated multiferroic compound CoCr2O4 by tuning the sublattice magnetic coupling is indeed of high interest from the fundamental and applied points of view.
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Affiliation(s)
- Canglong Li
- Key Laboratory of Microelectronics and Energy of Henan Province
- College of Physics and Electronic Engineering
- Xinyang Normal University
- Xinyang 464000
- P. R. China
| | - Chunlei Wang
- Key Laboratory of Microelectronics and Energy of Henan Province
- College of Physics and Electronic Engineering
- Xinyang Normal University
- Xinyang 464000
- P. R. China
| | - Qiankun Lei
- Key Laboratory of Microelectronics and Energy of Henan Province
- College of Physics and Electronic Engineering
- Xinyang Normal University
- Xinyang 464000
- P. R. China
| | - Godfrey Okumu Barasa
- Department of Physical Sciences
- Jaramogi Oginga Odinga University of Science and Technology
- Bondo
- Kenya
| | - Qingshan Fu
- School of Physics, Huazhong University of Science and Technology
- Wuhan 430074
- P. R. China
| | - Yang Qiu
- Key Laboratory of Microelectronics and Energy of Henan Province
- College of Physics and Electronic Engineering
- Xinyang Normal University
- Xinyang 464000
- P. R. China
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Manjunatha K, Angadi VJ, Ribeiro RAP, Oliveira MC, de Lázaro SR, Bomio MRD, Matteppanavar S, Rayaprol S, Babu PD, Pasha UM. Structural, electronic and magnetic properties of Sc 3+ doped CoCr 2O 4 nanoparticles. NEW J CHEM 2020. [DOI: 10.1039/d0nj03062g] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Experimental and theoretical analyses were combined to reveal the major properties of Co1−xScxCr2O4 nanoparticles – a putative candidate for magnetic applications.
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Affiliation(s)
- K. Manjunatha
- Department of Physics
- School of Engineering
- Presidency University
- Bangalore 560064
- India
| | | | - R. A. P. Ribeiro
- Department of Chemistry
- Minas Gerais State University
- Divinópolis
- Brazil
| | - M. C. Oliveira
- LSQM – Laboratory of Chemical Synthesis of Materials – Department of Materials Engineering
- Federal University of Rio Grande do Norte – UFRN
- Natal
- Brazil
| | - S. R. de Lázaro
- Department of Chemistry
- State University of Ponta Grossa
- Ponta Grossa
- Brazil
| | - M. R. D. Bomio
- LSQM – Laboratory of Chemical Synthesis of Materials – Department of Materials Engineering
- Federal University of Rio Grande do Norte – UFRN
- Natal
- Brazil
| | - S. Matteppanavar
- Department of Physics
- Basavaprabhu Kore Arts, Science, and Commerce College
- 591201 Chikodi
- India
| | - S. Rayaprol
- UGC-DAE CSR
- Mumbai Centre
- BARC Campus
- Mumbai 400085
- India
| | - P. D. Babu
- UGC-DAE CSR
- Mumbai Centre
- BARC Campus
- Mumbai 400085
- India
| | - U. Mahaboob Pasha
- Department of Physics
- School of Engineering
- Presidency University
- Bangalore 560064
- India
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Koutzarova T, Kolev S, Krezhov K, Georgieva B, Kovacheva D, Ghelev C, Vertruyen B, Boschini F, Mahmoud A, Tran LM, Zaleski A. Study of the Structural and Magnetic Properties of Co-Substituted Ba 2Mg 2Fe 12O 22 Hexaferrites Synthesized by Sonochemical Co-Precipitation. MATERIALS 2019; 12:ma12091414. [PMID: 31052287 PMCID: PMC6539902 DOI: 10.3390/ma12091414] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 04/24/2019] [Accepted: 04/27/2019] [Indexed: 11/16/2022]
Abstract
Ba2Mg0.4Co1.6Fe12O22 was prepared in powder form by sonochemical co-precipitation and examined by X-ray diffraction, Mössbauer spectroscopy and magnetization measurements. Careful XRD data analyses revealed the Y-type hexaferrite structure as an almost pure phase with a very small amount of CoFe2O4 as an impurity phase (about 1.4%). No substantial changes were observed in the unit cell parameters of Ba2Mg0.4Co1.6Fe12O22 in comparison with the unsubstituted compound. The Mössbauer parameters for Ba2Mg0.4Co1.6Fe12O22 were close to those previously found (within the limits of uncertainty) for undoped Ba2Mg2Fe12O22. Isomer shifts (0.27-0.38 mm/s) typical for high-spin Fe3+ in various environments were evaluated and no ferrous Fe2+ form was observed. However, despite the indicated lack of changes in the iron oxidation state, the cationic substitution resulted in a significant increase in the magnetization and in a modification of the thermomagnetic curves. The magnetization values at 50 kOe were 34.5 emu/g at 4.2 K and 30.5 emu/g at 300 K. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves were measured in magnetic fields of 50 Oe, 100 Oe, 500 Oe and 1000 Oe, and revealed the presence of two magnetic phase transitions. Both transitions are shifted to higher temperatures compared to the undoped compound, while the ferrimagnetic arrangement at room temperature is transformed to a helical spin order at about 195 K, which is considered to be a prerequisite for the material to exhibit multiferroic properties.
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Affiliation(s)
- Tatyana Koutzarova
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria.
| | - Svetoslav Kolev
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria.
| | - Kiril Krezhov
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria.
| | - Borislava Georgieva
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria.
| | - Daniela Kovacheva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., bld. 11, 1113 Sofia, Bulgaria.
| | - Chavdar Ghelev
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria.
| | - Benedicte Vertruyen
- Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium.
| | - Frederic Boschini
- Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium.
| | - Abdelfattah Mahmoud
- Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium.
| | - Lan Maria Tran
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland.
| | - Andrzej Zaleski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland.
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Zhang G, Cao J, Zhao C, Han B, Ma C, Gao Z, Zeng T. Facile synthesis and magnetic and electrical properties of layered chalcogenides K 2CoCu 3Q 4 (Q for S and Se). Dalton Trans 2018; 47:14968-14974. [PMID: 30298884 DOI: 10.1039/c8dt03294g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Layered transition-metal chalcogenides have attracted great interest due to their unique electronic and optical properties. Here, we represent two layered quaternary chalcogenides K2CoCu3S4 and K2CoCu3Se4 prepared by a convenient hydrothermal route. From powder XRD and TEM analyses, K2CoCu3Q4 possesses a tetragonal ThCr2Si2-type structure with a random arrangement of Co and Cu atoms. The phase purity of the samples was confirmed by ICP, SEM, and EDS analyses, and the oxidation states of Co and Cu atoms were determined to be +3 and +1 by XPS spectra. Both samples show a weak ferromagnetic behavior at low temperature induced by spin-canted antiferromagnetic ordering. The temperature dependent resistivity, ρ(T), reveals a metallic nature for stoichiometric K2CoCu3S4. The semiconducting behavior of K2CoCu3Se4 could be explained better by variable range hopping (VRH) rather than adiabatic small polaron hopping (SPH). This new series of layered chalcogenides may offer a promising candidate for potential electronic applications.
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Affiliation(s)
- Ganghua Zhang
- Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Research Institute of Materials, Shanghai 200437, P. R. China.
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