Abstract

An analysis of augmented plane wave results obtained for the cubic perovskite compounds BaBiO3, KBiO3, and BaPbO3 of coherent potential approximation results for the alloys Ba1-xKxBiO3 and BaPb1-yBiyO3 is made by the alternating lattice method. We show that the electronic structure near the Fermi level of the pure compounds and their alloys can be well understood by the alternating nature of the Bi(or Pb)-O sublattices in a tight-binding scheme involving a small set of orbitals.

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