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Electron Microscopy of Ferroelectric Bismuthate Compounds

  • J. S. Anderson
  • J. L. Hutchison
  • C. N. R. Rao

Abstract

Layered bismuthate compounds of general formula Bi2Am-2Bm-1O3m are ferroelectrics with fairly high Curie temperatures They consist of finite perovskite slabs (An-1BnO3n-1 n-1) with n layers of B-cations (Ti4+, Nb5+, etc.) and n-1 layers of A-cations (Bi3+ or Ba2+) sandwiched between Bi2O2 2+ layers; the square pyramidal BiO4 groups share edges in such a way that successive perovskite layers are in anti-phase, by a displacement of \( \frac{1}{2}\left[ {110} \right] \). The Bi atoms in the Bi2O2 sheets occupy virtual A-sites of the perovskite lattice, as can be seen in Figure 1; they are displaced from the ideal A-positions by less than 0.05 nm.

Keywords

Lattice Image Simultaneous Displacement Phase Boundary Movement Successive Member Slab Edge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • J. S. Anderson
    • 1
  • J. L. Hutchison
    • 1
  • C. N. R. Rao
    • 2
  1. 1.Edward Davies Chemical LaboratoriesUniversity College of WalesAberystwythUK
  2. 2.Indian Institute of TechnologyKanpurIndia

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