Phase Relations in Bismuthsesquioxide

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Abstract
The structural relations between the α, β, γ and δ‐phase of Bi2O3 have been investigated. The analogies between the structures of the various phases and defect fluorite structure are discussed. Conductivity and electrostatic data indicate that in the disordered fluorite related structure of the solid electrolyte δ‐Bi2O3 ordering of the vacant sites in the anion sublattice occurs. The α and β‐phase can be described with a disported defect fluorite structure with the vacant anion sites separated by 1/2 〈111〉f and 1/2 〈110〉f and by 1/2 〈100〉f, respectively. A model is given for the motion of the atoms in the Bismuthsublattice at the α → δ transition.

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