Ba 4 RuMn 2 O 10 : A Noncentrosymmetric Polar Crystal Structure with Disordered Trimers.

Autor: Skaggs CM; Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States., Siegfried PE; Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, United States.; Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, United States., Cho JS; Department of Physics, Sogang University, Seoul 04017, Republic of Korea., Xin Y; National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States., Garlea VO; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States., Taddei KM; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.; X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States., Bhandari H; Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, United States.; Department of Physics and Astronomy and Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, Notre Dame, Indiana 46556, United States., Croft M; Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States., Ghimire NJ; Department of Physics and Astronomy and Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, Notre Dame, Indiana 46556, United States., Jang JI; Department of Physics, Sogang University, Seoul 04017, Republic of Korea., Tan X; Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States.; Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, United States.
Jazyk: angličtina
Zdroj: Chemistry of materials : a publication of the American Chemical Society [Chem Mater] 2024 Jun 11; Vol. 36 (12), pp. 6053-6061. Date of Electronic Publication: 2024 Jun 11 (Print Publication: 2024).
DOI: 10.1021/acs.chemmater.4c00586
Abstrakt: Phase-pure polycrystalline Ba 4 RuMn 2 O 10 was prepared and determined to adopt the noncentrosymmetric polar crystal structure (space group Cmc 2 1 ) based on results of second harmonic generation, convergent beam electron diffraction, and Rietveld refinements using powder neutron diffraction data. The crystal structure features zigzag chains of corner-shared trimers, which contain three distorted face-sharing octahedra. The three metal sites in the trimers are occupied by disordered Ru/Mn with three different ratios: Ru1:Mn1 = 0.202(8):0.798(8), Ru2:Mn2 = 0.27(1):0.73(1), and Ru3:Mn3 = 0.40(1):0.60(1), successfully lowering the symmetry and inducing the polar crystal structure from the centrosymmetric parent compounds Ba 4 T 3 O 10 (T = Mn, Ru; space group Cmca ). The valence state of Ru/Mn is confirmed to be +4 according to X-ray absorption near-edge spectroscopy. Ba 4 RuMn 2 O 10 is a narrow bandgap (∼0.6 eV) semiconductor exhibiting spin-glass behavior with strong magnetic frustration and antiferromagnetic interactions.
Competing Interests: The authors declare no competing financial interest.
(© 2024 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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