Abstract
A previously described solid solution in the system Bi
2
O
3
-Nb
2
O
5
based on the δ-Bi
2
O
3
structure has been reinvestigated by electron diffraction and high resolution electron microscopy. Four distinct phases have been found, all of which are based upon defect fluorite structures, and the structural principles of the phase with the greatest compositional range have been elucidated. This involves an adaption of elements of the pyrochlore structure with an ordering of niobium-oxygen octahedra into groups lying on the {111} planes of an enlarged cubic unit cell, separated by a matrix of δ-Bi
2
O
3
structure.
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