Abstract
A transition-metal-only MnFe 0.5 Ru 0.5 O 3 polycrystalline oxide was prepared by a reaction of starting materials MnO, MnO 2 , Fe 2 O 3 , RuO 2 at 6 GPa and 1873 K for 30 minutes. A combination of X-ray and neutron powder diffraction refinements indicated that MnFe 0.5 Ru 0.5 O 3 adopts the corundum (α-Fe 2 O 3 ) structure type with space group R3c, in which all metal ions are disordered. The centrosymmetric nature of the MnFe 0.5 Ru 0.5 O 3 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 MnFe 0.5 Ru 0.5 O 3 showed the oxidation states of Mn, Fe, and Ru to be 2+/3+, 3+, and ∼4+, respectively. Resistivity measurements revealed that MnFe 0.5 Ru 0.5 O 3 is a semiconductor. Magnetic measurements and magnetic structure refinements indicated that MnFe 0.5 Ru 0.5 O 3 orders antiferromagnetically around 400 K, with magnetic moments slightly canted away from the c axis. 57 Fe Mössbauer confirmed the magnetic ordering and Fe 3+ (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 MnFe 0.5 Ru 0.5 O 3 and related corundum Mn 2 BB′O 6 derivatives is discussed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 509-522 |
| Number of pages | 14 |
| Journal | Journal of Materials Chemistry C |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2019 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Materials Chemistry
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