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Title: Layered Perovskite-Like Pb2Fe2O5 Structure as a Parent Matrix for the Nucleation and Growth of Crystallographic Shear Planes
Authors: Batuk, Dmitry
Hadermann, Joke
Abakumov, Artem M.
VRANKEN, Thomas 
VAN BAEL, Marlies 
Van Tendeloo, Gustaaf
Issue Date: 2011
Source: INORGANIC CHEMISTRY, 50(11). p. 4978-4986
Abstract: The Pb2Fe2O5 compound with a layered intergrowth structure has been prepared by a solid-state reaction at 700 degrees C. The incommensurate compound crystallizes in a tetragonal system with alpha = 3.9037(2) angstrom, c = 3.9996(4) angstrom, and q = 0.1186(4)c star, or when treated as a commensurate approximant, alpha = 3.9047(2) angstrom, c = 36.000(3) angstrom, space group I4/mmm. The crystal structure of Pb2Fe2O5 was resolved from transmission electron microscopy data. Atomic coordinates and occupancies of the cation positions were estimated from high-angle annular dark-field scanning transmission electron microscopy data. Direct visualization of the positions of the oxygen atoms was possible using annular bright-field scanning transmission electron microscopy. The structure can be represented as an intergrowth of perovskite blocks and partially disordered blocks with a structure similar to that of the Bi2O2 blocks in Aurivillius-type phases. The A-cation positions at the border of the perovskite block and the cation positions in the Aurivillius-type blocks are jointly occupied by Pb2+ and Fe3+ cations, resulting in a layer sequence along the c axis: -PbO-FeO2-PbO-FeO2-Phys(7/8)Fe(1/8)-O1-x-Fe-5/8/Pb-3/8-O-2-Fe5/8Pb3/8-. Upon heating, the layered Pb2Fe2O5 structure transforms into an anion-deficient perovskite modulated by periodically spaced crystallographic shear (CS) planes. Considering the layered Pb2Fe2O5 structure as a parent matrix for the nucleation and growth of CS planes allows an explanation of the specific microstructure observed for the CS structures in the Pb-Fe-O system.
Notes: [Batuk, Dmitry; Hadermann, Joke; Abakumov, Artem; Van Tendeloo, Gustaaf] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium. [Vranken, Thomas; Hardy, An; Van Bael, Marlies] Hasselt Univ, Inst Mat Res Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium. [Hardy, An; Van Bael, Marlies] IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium.
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ISSN: 0020-1669
e-ISSN: 1520-510X
DOI: 10.1021/ic200211x
ISI #: 000290978400038
Rights: © 2011 American Chemical Society.
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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