id:"swepub:oai:research.chalmers.se:7a91bc0d-721c-44c4-950c-caefedd0dcd3"
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- Karlsson, Maths,1978Chalmers tekniska högskola,Chalmers University of Technology (författare)
Alkali-ion concentration dependence of the structure of proton-conducting alkali thio-hydroxogermanates investigated with neutron diffraction
- Artikel/kapitelEngelska2015
Förlag, utgivningsår, omfång ...
- Elsevier BV,2015
Nummerbeteckningar
- LIBRIS-ID:oai:research.chalmers.se:7a91bc0d-721c-44c4-950c-caefedd0dcd3
- https://doi.org/10.1016/j.ssi.2015.02.019DOI
- https://research.chalmers.se/publication/217849URI
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- Språk:engelska
- Sammanfattning på:engelska
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Anmärkningar
- The proton-conducting hydrated alkali thio-hydroxogermanate's MxGeSx(OH)(4) - x center dot yH(2)O (M = Na and K; x = 1 - 4,y approximate to 0.5 - 2) were investigated by means of neutron diffraction with the aim to elucidate how the structure changes as a function of alkali-ion concentration, x, type of alkali ion, M, and water content, y. For x = 1 - 3 we find that the materials are amorphous and composed of thio-hydroxogermanate anions, water molecules, and charge balancing alkali ions, whereas for x = 4 we find that the materials contain also a crystalline phase, suggesting that it is difficult to prepare purely amorphous materials for the highest alkali-ion concentration, for both the Na and K based materials. For x = 1 - 3, the structure is reflected by an intermediate-range ordering, with a characteristic length-scale ranging from approximately 6 to 9 angstrom, which is dependent on both x and M and which may be related to the separation distance between dimers of thio-hydroxogermanate anions. As x increases, the intermediate-range ordering shortens, possibly as the result of an increasing level of hydration water that may act as a dielectric medium that reduces the repulsive interaction between the negatively charged thio-hydroxogermanate anions and/or between the positively charged alkali ions. A comparison of the structural results to the reported conductivities of the same materials indicates a non-trivial relationship, which depends on both the type and concentration of alkali ions, as well as on the level of hydration water.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
- Proton conducting
- Thio-hydroxogermanate
- Fuel cell
- Neutron diffraction
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Nordström, Jonas,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)k00nojo (författare)
- Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (författare)
- Martin, SteveIowa State University (författare)
- Imberti, S.STFC Rutherford Appleton Laboratory (författare)
- Bowron, D.T.STFC Rutherford Appleton Laboratory (författare)
- Chalmers tekniska högskolaIowa State University (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Solid State Ionics: Elsevier BV274, s. 40-450167-2738
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