A TEM investigation of the (Bi1−xSrx)FeO3−x/2, 0.2≤x≤0.67, solid solution and a suggested superspace structural description thereof |
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| Authors: | R.L. Withers L. Bourgeois K. Balamurugan N. Harish Kumar P.N. Santhosh P.M. Woodward |
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| Affiliation: | aResearch School of Chemistry, Australian National University, Canberra, ACT 0200, Australia;bMonash Centre for Electron Microscopy and Department of Materials Engineering, Monash University, Victoria 3800, Australia;cDepartment of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India;dDepartment of Chemistry, Ohio State University, 100 West 18th Ave., Columbus, OH 43210-1185, USA |
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| 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  or one of the non-centrosymmetric sub-groups thereof, namely  ,  ,  and  . 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. |
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| Keywords: | Modulated structure Intergrowth compound Continuous solid solution TEM investigation Ferrites |
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