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

Tate, M.L.; Fuller, C.A.; Avdeev, M.; Brand, H.E.A.; McIntyre, G.J.; Radosavljevic Evans, I.

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


Authors

M.L. Tate

C.A. Fuller

M. Avdeev

H.E.A. Brand

G.J. McIntyre

I. Radosavljevic Evans



Contributors

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.

Citation

Tate, M., Fuller, C., Avdeev, M., Brand, H., McIntyre, G., & Radosavljevic Evans, I. (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. https://doi.org/10.1039/c7dt02871g

Journal Article Type Article
Acceptance Date Sep 3, 2017
Online Publication Date Sep 4, 2017
Publication Date Sep 4, 2017
Deposit Date Oct 10, 2017
Publicly Available Date Mar 29, 2024
Journal Dalton Transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 46
Issue 37
Pages 12494-12499
DOI https://doi.org/10.1039/c7dt02871g

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