Electron Microscopy of Ferroelectric Bismuthate Compounds

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


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.


Lattice Image Simultaneous Displacement Phase Boundary Movement Successive Member Slab Edge 
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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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