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

Alexander Schmidt, Martin Lerch, Jens Peter Eufinger, Jürgen Janek, Raimund Dolle, Hans Dieter Wiemhöfer, 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 Hebbe-Wagner measurements. Diffusion pathways and activation energies were determined additionally by quantum-chemical calculations. Ca12Al14O32(CN)2 shows a surprisingly high ionic conductivity of σ = 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
Early online date2 Oct 2014
DOIs
Publication statusPublished - 31 Dec 2014

Keywords

  • Cyanide ion conduction
  • Impedance spectroscopy
  • Mayenite
  • Neutron scattering
  • Quantum-chemical calculations

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Schmidt, A., Lerch, M., Eufinger, J. P., Janek, J., Dolle, R., Wiemhöfer, H. D., Tranca, I., Islam, M. M., Bredow, T., Boysen, H., & Hoelzel, M. (2014). CN-mayenite Ca12Al14O32(CN)2: Replacing mobile oxygen ions by cyanide ions. Solid State Sciences, 38, 69-78. https://doi.org/10.1016/j.solidstatesciences.2014.09.017