Abstract
Defect structure and conductivity behavior are discussed in the oxide ion conductor Bi3Nb0.8W0.2O7.1. Investigations were carried out using a combination of AC impedance spectroscopy and powder X-ray and neutron diffraction. Bi3Nb0.8W0.2O7.1 shows a defect fluorite type structure with evidence for superlattice ordering in the oxide ion sublattice. A detailed analysis of the diffraction results allow for proposed models for the defect structure and suggest vacancy trapping in the six coordinate environment of Nb5+/W6+ cations. The influence of the defect structure on ionic conductivity is discussed.
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