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A TEM investigation of the (Bi1-xSrx)Fe3+O3-x/2, 0.2≤x≤0.67, solid solution and a suggested superspace structural description thereof
Published in
2009
Volume: 182
   
Issue: 8
Pages: 2176 - 2184
Abstract
A careful transmission electron microscopy (TEM) investigation of an incommensurately modulated member of the (Bi1-xSrx)Fe3+O3-x/2□x/2, 0.2≤x≤0.67, solid solution has been carried out. High resolution (HR) TEM imaging is used to show the presence of at least 6-fold twinning on a rather fine (∼5 nm) scale. The (3+1)-d superspace group symmetry is suggested to be Pmmm (0, frac(1, 2), γ) or one of the non-centrosymmetric sub-groups thereof, namely P 2 mm (0, frac(1, 2), γ), Pm 2 m (0, frac(1, 2), γ), Pmm 2 (0, frac(1, 2), γ) and P 222 (0, frac(1, 2), γ). A superspace construction is then used to propose the nature of the local compositional ordering and, hence, of the oxygen-deficient slab that intergrows with the perovskite slab to produce the observed solid solution phase. The proposed compositional superspace atomic surfaces can be used to produce model structures at any composition within the solid solution range. © 2009 Elsevier Inc. All rights reserved.
About the journal
JournalJournal of Solid State Chemistry
ISSN00224596
Open AccessNo
Concepts (22)
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    ATOMIC SURFACES
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    CONTINUOUS SOLID SOLUTION
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    High resolution
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    INTERGROWTH COMPOUND
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    MODULATED STRUCTURE
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    Non-centrosymmetric
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    SOLID SOLUTION PHASE
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    SOLID SOLUTION RANGE
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    SUB-GROUPS
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    SUPERSPACE
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    SUPERSPACE GROUP
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    TEM
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    TEM INVESTIGATION
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    Crystallization
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    Ferrite
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    Model structures
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    Oxide minerals
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    Oxygen
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    Perovskite
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    Solidification
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    Transmission electron microscopy
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    Solid solutions