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MnFe0.5Ru0.5O3: An Above-Room-Temperature Antiferromagnetic Semiconductor

Tan, Xiaoyan, McCabe, E. E., Orlandi, Fabio, Manuel, Pascal, Batuk, Maria, Hadermann, Joke, Deng, Zheng, Jin, Changqing, Nowik, Israel, Herber, Rolfe H., and others. (2018) MnFe0.5Ru0.5O3: An Above-Room-Temperature Antiferromagnetic Semiconductor. Journal of Materials Chemistry C, (7). pp. 509-522. ISSN 2050-7526. E-ISSN 2050-7534. (doi:10.1039/c8tc05059g) (KAR id:70566)

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Abstract

A transition-metal-only MnFe0.5Ru0.5O3 polycrystalline oxide was prepared by a reaction of starting materials MnO, MnO2, Fe2O3, RuO2 at 6 GPa and 1873 K for 30 minutes. A combination of X-ray and neutron powder diffraction refinements indicated that MnFe0.5Ru0.5O3 adopts the corundum (a-Fe2O3) structure type with space group R3 @#x0305;c, in which all metal ions are disordered. The centrosymmetric nature of the MnFe0.5Ru0.5O3 structure is corroborated by transmission electron microscopy, lack of optical second harmonic generation, X-ray absorption near edge spectroscopy, and Mössbauer spectroscopy. X-ray absorption near edge spectroscopy of MnFe0.5Ru0.5O3 showed the oxidation states of Mn, Fe, and Ru to be 2+/3+, 3+, and ~4+, respectively. Resistivity measurements revealed that MnFe0.5Ru0.5O3 is a semiconductor. Magnetic measurements and magnetic structure refinements indicated that MnFe0.5Ru0.5O3 orders antiferromagnetically around 400 K, with magnetic moments slightly canted away from the c axis. 57Fe Mössbauer confirmed the magnetic ordering and Fe3+ (S = 5/2) magnetic hyperfine splitting. First principles calculations are provided to understand the electronic structure more thoroughly. A comparison of synthesis and properties of MnFe0.5Ru0.5O3 and related corundum Mn2BB'O6 derivatives is discussed.

Item Type: Article
DOI/Identification number: 10.1039/c8tc05059g
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Emma McCabe
Date Deposited: 03 Dec 2018 09:45 UTC
Last Modified: 28 Aug 2020 12:50 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/70566 (The current URI for this page, for reference purposes)
McCabe, E. E.: https://orcid.org/0000-0001-5868-4570
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