Publication date: 10th April 2024
Potentiostatic conductivity measurements are widely used to characterize ion transport in solids. Proper post-preparation is, however, needed to guarantee optimal test specimens in the form of dense pellets with metallic electrodes. Nuclear magnetic resonance (NMR), on the other hand, serves as a contactless and non-destructive method suitable to analyze crystalline as well as amorphous (powder) samples. Here, we compare results from NMR such as activation energies and jump rates with those from alternating current (AC) conductivity spectroscopy to identify the similarities and differences between the two approaches. In many cases, rather consistent pictures of the various dynamic situations are found if we consider that the physical quantities depend on the time window to which the two methods are sensitive. Besides findings from conductivity measurements and 23Na, 7Li NMR experiments on Nb-bearing Na3+xZr2Si2+xP1–xO12 (x = 0 and 0,4) [1], nanocrystalline Li4PS4I [2] and on hectorite-type Li0.5[Mg2.5Li0.5]Si4O10F2 [3], we will present very recent results on ion dynamics in Ge-bearing Li6PS5I, Li10GeP2S12, and LiTi2(PS4)3 obtained from variable-temperature NMR spin-alignment echo and spin-lattice relaxation measurements carried out down to cryogenic temperatures.
We thank the FFG project safeLIB for financial support.
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