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MnFe 0.5 Ru 0.5 O 3: An above-room-temperature antiferromagnetic semiconductor

  • Xiaoyan Tan
  • , Emma E. McCabe
  • , Fabio Orlandi
  • , Pascal Manuel
  • , Maria Batuk
  • , Joke Hadermann
  • , Zheng Deng
  • , Changqing Jin
  • , Israel Nowik
  • , Rolfe Herber
  • , Carlo U. Segre
  • , Sizhan Liu
  • , Mark Croft
  • , Chang Jong Kang
  • , Saul Lapidus
  • , Corey E. Frank
  • , Haricharan Padmanabhan
  • , Venkatraman Gopalan
  • , Meixia Wu
  • , Man Rong Li
  • Gabriel Kotliar, David Walker, Martha Greenblatt

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)509-522
Number of pages14
JournalJournal of Materials Chemistry C
Volume7
Issue number3
DOIs
StatePublished - 2019

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Materials Chemistry

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