Structure of Proton-Conducting Alkali Thio-Hydroxogermanates

Maths Karlsson, Aleksandar Matic, Itai Panas, Daniel T. Bowron, Steve W. Martin, Carly R. Nelson, Chad A. Martindale, Andreas Hall, Lars Borjesson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Using it combination Of neutron diffraction, infrared spectroscopy. and first-principles calculations, we have investigated the structure of hydrated and dehydrated proton conducting alkali thio-hydroxogermanates of general formula M2GeS2(OH)(2)center dot yH(2)O (M = K, Rb, and Cs). The results show that the structure of hydrated and dry materials are basically the same, which confirms previous indications that the main effect of heating these materials is just a loss of water. We suggest that in the hydrated state the structure of these materials is built of dimers of thio-hydroxogermanate anions, with the water molecules acting, as bridges between such dimers. In the dehydrated structure,. file thio-hydroxogermanate anions instead form an extended network- through the formation of interdimer hydrogen bonds through the -OH groups in the structure. The alkali ions are suggested to act as "space-fillers" in voids formed by the thio-hydroxogermanate anion dimers. in both the hydrated and the dehydrated state.
    Original languageEnglish
    Pages (from-to)6014-6021
    JournalChemistry of Materials
    Volume20
    Issue number19
    DOIs
    Publication statusPublished - 2008

    Subject classification (UKÄ)

    • Materials Chemistry

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