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Relationship between the Crystal Structure and Electrical Properties of Oxide Ion Conducting BaWNbO.

08:00 EDT 12th September 2018 | BioPortfolio

Summary of "Relationship between the Crystal Structure and Electrical Properties of Oxide Ion Conducting BaWNbO."

The oxide ionic conductor BaWNbO has been synthesized as part of an investigation into the new class of BaM'M''O (M' = W, Mo; M'' = Nb) oxide-ion conducting hexagonal perovskite derivatives. The substitution of W for Nb in BaWNbO leads to an increase in the oxygen content, which enhances the low-temperature ionic conductivity. However, at 400 °C, the ionic conductivity of BaWNbO is still significantly lower than the molybdenum compound BaMoNbO. Remarkably, at 600 °C the bulk oxide ionic conductivities of BaMoNbO, BaWNbO, and BaWNbO are very similar (σ = 0.0022, 0.0017, and 0.0016 S cm, respectively). The variable-temperature neutron diffraction results reported here demonstrate that BaWNbO undergoes a similar structural rearrangement to BaMoNbO above 300 °C, but the ratio of (W/Nb)O tetrahedra to (W/Nb)O octahedra rises at a faster rate upon heating between 300 and 600 °C. There is a clear relationship between the ionic conductivity of BaM'M''O (M' = W, Mo; M'' = Nb) phases and the number of tetrahedrally coordinated M' and M ″ cations present within the crystal structure.

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This article was published in the following journal.

Name: Inorganic chemistry
ISSN: 1520-510X
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