Pb2.85Ba2.15Fe4SnO13: A new member of the A(n)B(n)O(3n-2) anion-deficient perovskite-based homologous seriesстатья

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[1] Pb2.85ba2.15fe4sno13: A new member of the a(n)b(n)o(3n-2) anion-deficient perovskite-based homologous series / O. E. Korneychik, M. Batuk, A. M. Abakumov et al. // Journal of Solid State Chemistry. — 2011. — Vol. 184, no. 12. — P. 3150–3157. Pb2.85Ba2.15Fe4SnO13, a new n=5 member of the anion-deficient perovskite based A(n)B(n)O(3n-2) (A = Pb, Ba, B=Fe, Sn) homologous series, was synthesized by the solid state method. The crystal structure of Pb2.85Ba2.15Fe4SnO13 was investigated using a combination of neutron powder diffraction, electron diffraction, high angle annular dark field scanning transmission electron microscopy and Mossbauer spectroscopy. It crystallizes in the Ammm space group with unit cell parameters a=5.7990(1) angstrom, b=4.04293(7) angstrom and c=26.9561(5) angstrom. The Pb2.85Ba2.15Fe4SnO13 structure consists of quasi two-dimensional perovskite blocks separated by 1/2[110]((1) over bar 01)(p) crystallographic shear (CS) planes. The corner-sharing FeO6 octahedra at the CS planes are transformed into edge-sharing FeO5 distorted tetragonal pyramids. The octahedral positions in the perovskite blocks between the CS planes are jointly taken up by Fe and Sn, with a preference of Sn towards the position at the center of the perovskite block. The chains of FeO5 pyramids and (Fe,Sn)O-6 octahedra of the perovskite blocks delimit six-sided tunnels at the CS planes occupied by double chains of Pb atoms. The compound is antiferromagnetically ordered below T-N=368 +/- 15 K. (C) 2011 Elsevier Inc. All rights reserved. [ DOI ]

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