Original close-packed structure and magnetic properties of the Pb4Mn9O20 manganite

Artem M. Abakumov, Joke Hadermann, Alexander A. Tsirlin, Haiyan Tan, Jo Verbeeck, Haitao Zhang, Evgeny V. Dikarev, Roman V. Shpanchenko, Evgeny V. Antipov

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The crystal structure of the Pb4Mn9O20 compound (previously known as "Pb0.43MnO2.18") was solved from powder X-ray diffraction, electron diffraction, and high resolution electron microscopy data (S.G. Pnma, a=13.8888(2) Å, b=11.2665(2) Å, c=9.9867(1) Å, RI=0.016, RP=0.047). The structure is based on a 6H (cch)2 close packing of pure oxygen "h"-type (O16) layers alternating with mixed "c"-type (Pb4O12) layers. The Mn atoms occupy octahedral interstices formed by the oxygen atoms of the close-packed layers. The MnO6 octahedra share edges within the layers, whereas the octahedra in neighboring layers are linked through corner sharing. The relationship with the closely related Pb3Mn7O15 structure is discussed. Magnetization measurements reveal a peculiar magnetic behavior with a phase transition at 52 K, a small net magnetization below the transition temperature, and a tendency towards spin freezing.

Original languageEnglish
Pages (from-to)2231-2238
Number of pages8
JournalJournal of Solid State Chemistry
Volume182
Issue number8
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Close packing
  • Crystal structure
  • EELS
  • Lead manganese oxide
  • Magnetic properties
  • Transmission electron microscopy

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