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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: POSTERS Dynamics and Diffusion

CPP 8.2: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Raman spectroscopy of poly- and single-crystalline 12CaO·7Al₂O₃ (C12A7) at different temperatures — •Artur S. Seifert¹, Ilia Valov², Stefan G. Ebbinghaus³, Peter J. Klar¹, and Juergen Janek² — ¹Institute of Experimental Physics I, Justus-Liebig-University, Heinrich-Buff-Ring 16, D-35392 Giessen. — ²Institute of Physical Chemistry, Justus-Liebig-University, Heinrich-Buff-Ring 58, D-35392 Giessen. — ³Solid State Chemistry, University of Augsburg, Universitätsstraße 1, D-86159 Augsburg.

Poly-crystalline 12CaO·7Al₂O₃ (mayenite) was synthesized by a solid reaction of Al₂O₃ and CaCO₃. Afterwards single-crystalline 12CaO·7Al₂O₃ of high purity was produced by a zone melt process. It has been recently suggested that reduced mayenite can be used as transparent conducting oxide (TCO) but this material is also known as an ion conducting solid electrolyte with fast oxygen transport. We study the variation of the vibrational modes of 12CaO·7Al₂O₃ as function of temperature in the range from 290 K to 900 K in different atmospheres, i.e. nitrogen, air and water. The vibration properties will be discussed with respect to ion storage and ion mobility within the material.