CN-mayenite Ca12Al14O32(CN)2 ions: replacing mobile oxygen ions by cyanide

Alexander Schmidt , Martin Lerch (Corresponding author), Jens-Peter Eufinger, Jürgen Janek, Raimund Dolle, Hans-Dieter Wiemhofer, Ionut Tranca, Mazharul M. Islam, Thomas Bredow, Hans Boysen, Markus Hoelzel

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Abstract

CN-mayenite (Ca12Al14O32(CN)2) is a promising candidate for high-temperature CN- conductivity in a solid due to its special structural features. It was prepared by a solidegas reaction. The transport processes were investigated by means of in situ high-temperature neutron diffraction, impedance spectroscopy and additional HebbeWagner measurements. Diffusion pathways and activation energies were determined additionally by quantum-chemical calculations.
Ca12Al14O32(CN)2 shows a surprisingly high ionic conductivity of s = 1.4∙10^-3 S/cm at 1173 K (Ea =4.3 eV) and can be considered as first example of a new kind of solid anion conductor with a mobile molecular anion.
Original languageEnglish
Pages (from-to)69-78
Number of pages10
JournalSolid State Sciences
Volume38
DOIs
Publication statusPublished - 30 Sep 2014
Externally publishedYes

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Keywords

  • Mayenite

Cite this

Schmidt , A., Lerch, M., Eufinger, J-P., Janek, J., Dolle, R., Wiemhofer, H-D., ... Hoelzel, M. (2014). CN-mayenite Ca12Al14O32(CN)2 ions: replacing mobile oxygen ions by cyanide . Solid State Sciences, 38, 69-78. https://doi.org/10.1016/j.solidstatesciences.2014.09.017