Are There Ordering Effects in Ba(Pb,Bi)O3 and (Ba,K)BiO3?

  • U. Hahn
  • G. Vielsack
  • W. Weber
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 113)

Abstract

A simple model is presented for the origin of the wide nonmetallic ranges in the (Ba, K)(Bi, Pb)O 3 alloy phase diagram, proposing that the semiconducting behaviour is caused by the presence of incommensurate oxygen breathing-type charge density waves as well as Bi/Pb ordering waves. The model is studied for large variety of supercell configurations using a simple, yet realistic tight-binding Hamiltonian. Good agreement with experiment is found. Crucial predictions of the model can be tested by diffuse elastic scattering experiments.

Keywords

Disproportionation 

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1993

Authors and Affiliations

  • U. Hahn
    • 1
  • G. Vielsack
    • 1
  • W. Weber
    • 1
  1. 1.Institut für PhysikUniversität DortmundDortmundFed. Rep. of Germany

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