Structure and magnetism of NaRu2O4 and Na 2.7Ru4O9

K. A. Regan, Q. Huang, M. Lee, A. P. Ramirez, R. J. Cava

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The structures of NaRu2O4 and Na2.7Ru 4O9 are refined using neutron diffraction. NaRu 2O4 is a stoichiometric compound consisting of double chains of edge sharing RuO6 octahedra. Na2.7Ru 4O9 is a non-stoichiometric compound with partial occupancy of the Na sublattice. The structure is a mixture of single, double and triple chains of edge-shared RuO6 octahedra. NaRu2O 4 displays temperature independent paramagnetism with χ0=1.23×10-4emu/molRuOe. Na2.7Ru4O9 is paramagnetic, χ0=2.0×10-4emu/molOe with Θw=-11.8K and a Curie constant of 0.0119 emu/mol Oe K. Specific heat measurements reveal a small upturn at low temperatures, similar to the upturn observed in La 4Ru6O19. The electronic contribution to the specific heat (γ) for Na2.7Ru4O9 was determined to be15 mJ/moleRu K2.

Original languageEnglish (US)
Pages (from-to)195-204
Number of pages10
JournalJournal of Solid State Chemistry
Volume179
Issue number1
DOIs
StatePublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Bronze
  • Ferrite
  • NaRu O
  • NaRuO
  • Paramagnetic
  • Ruthenate

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