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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Acknowledgements
We gratefully acknowledge the support of the EC framework 5 Centre of Excellence CEPHOMA (Contract No. ENK5-CT-2002-80666) and the Polish State Committee for Scientific Research (No. 3 T08A 037 27). We are also grateful to the ISIS facility, Rutherford Appleton Laboratory, UK for the beam time and to Dr R.I. Smith for his help in data collection.
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Abrahams, I., Krok, F., Chan, S.C.M. et al. Defect structure and ionic conductivity in Bi3Nb0.8W0.2O7.1 . J Solid State Electrochem 10, 569–574 (2006). https://doi.org/10.1007/s10008-006-0134-y
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DOI: https://doi.org/10.1007/s10008-006-0134-y