High entropy BaFe12-x(Ti/Mn/Ga/In)xO19 (x = 1–7) oxides: Correlation of the composition, entropy state, magnetic characteristics, and terahertz properties
Yao Y. Zhivulin V.E. Zykova A.R. Cherkasova N.A. Vinnik D.A. Trofimov E.A. Gudkova S.A. Zaitseva O.V. Taskaev S.V. Alyabyeva L.N. Gorshunov B.P. Gurchenko A.A. Lu S. Trukhanov S.V. Trukhanov A.V.
1 October 2023Elsevier Ltd
Ceramics International
2023#49Issue 1931549 - 31558 pp.
The BaFe12-x (Ti/Mn/Ga/In)xO19 (x = 1–7) high-entropy oxides (HEOs) were obtained by solid-phase synthesis. The correlation of the chemical composition (the level of the Fe replacement), structural parameters, magnetic characteristics, and terahertz (THz) properties was investigated. All studied samples were single-phase (SG: P63/mmc). Lattice parameters showed a monotonic increasing trend with an increase of (x). The key role in increasing the lattice parameters of HEOs may belong to the influence of In3+ ions, which are much larger in size than Fe3+ ions. As one of the possible reason for explanation of the lattice parameters behavior we hypothesized that partial charge transformation of the Mn3+ state to the Mn2+ state takes place in order to maintain electrical neutrality. Other cations (Ti/Ga/In) have stable oxidation state. The anisotropic nature of the increase in lattice parameters was demonstrated. No strong correlation between chemical composition and microstructural parameters of the investigated HEOs was observed. The magnetic characteristics of the BaFe12-x (Ti/Mn/Ga/In)xO19 (x = 1–7) HEOs were investigated at broad intervals of magnetic fields and temperatures. The behavior of the magnetic characteristics was shown to be the result of the magnetic structure frustration. In addition, terahertz electrodynamic properties were studied by measuring spectra of complex dielectric permittivity at frequencies 0.2–1.2 THz in the temperature interval 20–300 K. The spectra indicate the presence of a higher-frequency infrared phonon resonance, whose damping decreases with cooling, as well as an excitation below 0.2 THz that freezes out at low temperatures, the origin of which is associated with the polycrystalline nature of the materials.
Hexaferrites , High-entropy oxides , Magnetic characteristics , Structural parameters , Terahertz electrodynamic properties
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MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
Laboratory of Single Crystal Growth, South Ural State University, 76, Lenin av., Chelyabinsk, 454080, Russian Federation
Laboratory of Semiconductor Oxide Materials, Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow, 141701, Russian Federation
Chelyabinsk State University, 129, Bratiev Kashirinykh st., Chelyabinsk, 454001, Russian Federation
Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow, 141701, Russian Federation
Smart Sensors Laboratory, Department of Electronic Materials Technology, National University of Science and Technology MISiS, 4, Leninskiy av., Moscow, 119049, Russian Federation
SSPA “Scientific and Practical Materials Research Centre of NAS of Belarus”, 19, P. Brovki str., Minsk, 220072, Belarus
L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage
Laboratory of Single Crystal Growth
Laboratory of Semiconductor Oxide Materials
Chelyabinsk State University
Laboratory of Terahertz Spectroscopy
Smart Sensors Laboratory
SSPA “Scientific and Practical Materials Research Centre of NAS of Belarus”
L.N. Gumilyov Eurasian National University
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