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Regensburg 2016 – scientific programme

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MI: Fachverband Mikrosonden

MI 8: Crystallography in Materials Science (KR, DF, MI)

MI 8.2: Talk

Thursday, March 10, 2016, 16:00–16:20, H26

Investigation of the sodium solid electrolyte Na5YSi4O12 — •Wolfram Münchgesang1, Anastasia Vyalikh1, Falk Meutzner1, Tina Nestler1, Dörte Wagner2, Axel Rost2, Ulrike Langklotz2, Jochen Schilm2, Tilmann Leisegang1, and Dirk C. Meyer11Technische Universität Bergakademie Freiberg, Institut für Experimentelle Physik, Leipziger Straße 23, 09596 Freiberg, Germany — 2Fraunhofer Institute für Ceramic Technologies and Systems IKTS, Winterbergstraße 28, 01277 Dresden, Germany

Beside the well-known sodium solid electrolytes β-Alumina and NASICON, Na5YSi4O12 (NYS) is another promising crystal structure with a high ionic conductivity. Its main advantage over the two above-mentioned structures is the reduced production complexity and the associated costs. However, very little is known about its complex crystal structure and properties. Starting from a crystallographic point of view, sodium ion conduction pathways have been considered with the Voronoi-Dirichlet and the energy-scaled bond valence approaches, and compared with the pathways in other ion conductors.
In the present work, the crystal structure and ionic conductivity in polycrystalline NYS-materials, obtained by a glass-ceramic process, has been analysed using solid-state NMR and Electrical Impedance Spectroscopy respectively, and interpreted in respect to the theoretical predictions.
This work was financed by the BMWi within the project BaSta (0325563D) and the BMBF within the project SyNeSteSia (05K2014).

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