Coming soon: Ionic transport and diffusion in beta-alumina
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A new study investigating Na ion dynamics in highly sintered Na beta-alumina using GHz conductivity spectroscopy and Na NMR, providing a comprehensive view of both short- and long-range transport. Our results reveal a conductivity of 4 mS / cm at ambient temperature, governed by an activation energy of 0.3 eV for long-range transport and 0.13 eV for short-range motions, with excellent consistency between electric relaxation and NMR data. |
The study is part of the Solid State Ionics 100 special issue initialized by Will Chueh (Stanford).
See Solid State Ionics .
Coming soon: 2D ionic transport in Li4C60
Lithiated Buckminster fullerene (Li₄C₆₀) has previosuly been identified as a fast Li⁺ ion conductor. Through our NMR analysis we characterized both long-range and localized Li⁺ dynamics. We show that long-range ion dynamics is of 2D nature and is to be characterized by an activation energy as low as 0.26 eV. Solid State Ionics, in press.
Mechanical properties of MOFs by Brillouin Scattering
The mechanical properties of metal-organic frameworks (MOFs) are of high fundamental and practical relevance. A particularly intriguing technique for determining anisotropic elastic tensors is Brillouin scattering, which is used in present contribution published in the Journal of Physical Chemistry Letters. A team of researchers from 6 different institutes in Austria and the University of California studies a MOF material developed at ICTM and combines the Brillouin scattering data with simulations of elastic properties and phonon bands, which are based on machine-learning force fields and dispersion-corrected density functional theory. This provides a comprehensive understanding of the experimental signals, which can be correlated to the longitudinal and transverse sound velocities of the material. Notably, the combination of the insights from simulations and experiments allows the determination of approximate values for the components of the elastic tensor of the studied material even when dealing with comparably small single crystals, which typically limit the range of accessible experimental data.
Morphology aspects in understanding ionic conduction in thiophosphates
Amorphous vs. crystalline: The (exact) morphology may strongly influence overall ion dynamics in many cases. For Li3PS4, if prepared via a solvent-assisted approach, the change of ionic conductivity between a fully X-ray amorphous sample and a crystalline one obtained after annealing was much less influenced by this principle. See our latest study in Dalton Trans.: Morphology-dependent Li+ ion dynamics in X-ray amorphous and crystalline Li3PS4 prepared by solvent-assisted synthesis, J. Spychala, C. Mandl, K. Hogrefe, H. M. R. Wilkening, B. Gadermaier, Dalton Trans. (2025) in press.
2025 IEEE International Symposium on Applications of Ferroelectrics (IEEE ISAF-ICE-ISIF-PFM 2025)
IEEE ISAF 2025 | Graz, Austria
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