Structure and magnetic properties of a new anion-deficient perovskite Pb2Ba2BiFe4ScO13 with crystallographic shear structure

Maria Batuk, Oleg A. Tyablikov, Alexander A. Tsirlin, Sergey M. Kazakov, Marina G. Rozova, Konstantin V. Pokholok, Dmitry S. Filimonov, Evgeny V. Antipov, Artem M. Abakumov, Joke Hadermann

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Pb2Ba2BiFe4ScO13, a new n = 5 member of the oxygen-deficient perovskite-based AnBnO 3n-2 homologous series, was synthesized using a solid-state method. The crystal structure of Pb2Ba2BiFe4ScO 13 was investigated by a combination of synchrotron X-ray powder diffraction, electron diffraction, high-angle annular dark-field scanning transmission electron microscopy and Mössbauer spectroscopy. At 900 K, it crystallizes in the Ammm space group with the unit cell parameters a = 5.8459(1) Å, b = 4.0426(1) Å, and c = 27.3435(1) Å. In the Pb 2Ba2BiFe4ScO13 structure, quasi-two-dimensional perovskite blocks are periodically interleaved with [1 1 0] (1̄ 0 1)p crystallographic shear (CS) planes. At the CS planes, the corner-sharing FeO6 octahedra are transformed into chains of edge-sharing FeO5 distorted tetragonal pyramids. B-positions of the perovskite blocks between the CS planes are jointly occupied by Fe 3+ and Sc3+. The chains of the FeO5 pyramids and (Fe,Sc)O6 octahedra delimit six-sided tunnels that are occupied by double columns of cations with a lone electron pair (Pb2+). The remaining A-cations (Bi3+, Ba2+) occupy positions in the perovskite block. According to the magnetic susceptibility measurements, Pb 2Ba2BiFe4ScO13 is antiferromagnetically ordered below TN ≈350 K.

Original languageEnglish
Pages (from-to)3459-3465
Number of pages7
JournalMaterials Research Bulletin
Volume48
Issue number9
DOIs
Publication statusPublished - Sep 2013
Externally publishedYes

Keywords

  • Electron microscopy
  • Magnetic properties
  • Oxides
  • X-ray diffraction

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