Synthesis and characterisation of new Bi (III)-containing apatite-type oxide ion conductors: the influence of lone pairs
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Date
2017-09-04
Journal Title
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Publisher
Royal Society of Chemistry
Abstract
Lone-pair cations are known to enhance oxide ion conductivity in fluorite- and Aurivillius-type materials. Among the apatite-type phases, the opposite trend is found for the more widely studied silicate oxide ion conductors, which exhibit a dramatic decrease in conductivity on Bi(III) incorporation. In this work, the influence of lone-pair cations on the properties of apatite-type germanate oxide ion conductors has been investigated by preparing and characterising seven related compositions with varying Bi(III) content, by X-ray and neutron powder diffraction and impedance spectroscopy. All materials are very good oxide ion conductors (with conductivities of up to 1.29 × 10−2 S cm−1 at 775 °C). Increasing Bi(III) content leads to increases in conductivity by up to an order of magnitude, suggesting significant differences in the oxide-ion conduction mechanisms between lone-pair-containing apatite-type germanate and silicate solid electrolytes. © The Royal Society of Chemistry 2017
Description
Keywords
Electric conductivity, Oxides, Cations, Fluorite, Apatites, Silicates, X-ray diffraction, Neutron diffraction, Solid electrolytes
Citation
Tate, M. L., Fuller, C. A., Avdeev, M., Brand, H. E. A., McIntyre, G. J., & Evans, I. R. (2017). Synthesis and characterisation of new Bi (III)-containing apatite-type oxide ion conductors: the influence of lone pairs. Dalton Transactions, 46(37), 12494-12499. doi:10.1039/C7DT02871G