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Synthesis and characterisation of new Bi(III)-containing apatite-type oxide ion conductors: the influence of lone pairs

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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.

Graphical abstract: Synthesis and characterisation of new Bi(iii)-containing apatite-type oxide ion conductors: the influence of lone pairs

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Publication details

The article was received on 04 Aug 2017, accepted on 03 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02871G
Citation: Dalton Trans., 2017, Advance Article
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    Synthesis and characterisation of new Bi(III)-containing apatite-type oxide ion conductors: the influence of lone pairs

    M. L. Tate, C. A. Fuller, M. Avdeev, H. E. A. Brand, G. J. McIntyre and I. Radosavljevic Evans, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02871G

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