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. Meyer¹ — ¹Technische 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).