A composite modulated structure mechanism for Ag+ fast ion conduction in pearceite and polybasite mineral solid electrolytes

R. L. Withers*, L. Norén, T. R. Welberry, L. Bindi, M. Evain, S. Menchetti

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    A careful electron diffraction investigation of pearceite-Tac and polybasite-Tac samples in the Ag+ fast ion conducting state reveals that the average hexagonal [AgI 9]9+ sub-structure in these mineral solid electrolyte systems is mutually incommensurable with respect to the remaining [(AgI,CuI)6(AsIII,SbIII)2S7]2-[CuIS4]7- framework sub-structure. It is shown how the mutual incommensurability of the two component sub-structures can be compatible with crystal chemical commonsense, with previously reported average structure refinements of these phases as well as providing an insight into their Ag+ fast ion conductivity at such low temperatures. In addition, Ag+/Cu+ ion ordering (and associated displacive shifts of the centreing S2- ions) in the S2-(Ag,Cu)6 octahedral sites is shown to provide a mechanism for low temperature superstructure ordering.

    Original languageEnglish
    Pages (from-to)2080-2089
    Number of pages10
    JournalSolid State Ionics
    Volume179
    Issue number37
    DOIs
    Publication statusPublished - 15 Nov 2008

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