Structure and magnetic properties of hollandite Ba1.2Mn 8O16

S. Ishiwata, J. W.G. Bos, Q. Huang, R. J. Cava

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Abstract

The synthesis, crystal structure and magnetic properties of Ba 1.2Mn8O16, obtained using a KCl mineralizer, are reported. This material crystallizes in the monoclinic hollandite structure, containing Mn-O double chains (space group: I 2/m, a ≤ 10.052(1) Å, b ≤ 2.8579(2) Å, c ≤ 9.7627(10) Å, β ≤ 89.96(1)°), and undergoes a magnetic transition at 40 K with the magnetization having a small ferromagnetic component. The ordering temperature is nearly 10 times lower than expected from the Weiss temperature of -385 K, evidencing magnetic frustration. Preliminary neutron powder diffraction studies suggest a complex spin arrangement within the ac-plane (perpendicular to the chain axis). The resistivity is consistent with one-dimensional variable range hopping.

Original languageEnglish (US)
Pages (from-to)3745-3752
Number of pages8
JournalJournal of Physics Condensed Matter
Volume18
Issue number15
DOIs
StatePublished - Apr 19 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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