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MM: Fachverband Metall- und Materialphysik

MM 3: Transport - Atoms and Ions I

MM 3.3: Vortrag

Montag, 16. März 2020, 10:45–11:00, IFW A

Combination of ⁷Li-Field-Cycling and T1ρ-NMR experiments to investigate metallic lithium and lithium solid-state ion conductors. — •Philipp Seipel, Edda Winter, and Michael Vogel — AG Vogel, Institut für Physik kondensierter Materie, TU Darmstadt

Nuclear Magnetic Resonance offers a broad range of possibilities for determining correlation times of lithium ionic motion in Li-Ion conductors in the range of 10⁰ s to 10^-10 s. One method for determining the dynamics is to measure the spin-lattice relaxation T1, which is sensitive to dynamics on the time scale of the inverse Larmor-frequency ω . For superconducting spectrometers, this is usually in the range of τ ≈ 10^-9 s. In order to investigate slow processes, it is beneficial to measure T1(ω ) at low magnetic fields (ω ≈ kHz) whereas ⁷Li-Field-Cycling NMR is a powerful method to do so [1,2]. In these experiment, it is necessary to switch between low and high magnetic fields during the measurement to enhance the signal intensity, whereby the measurable T1 values are limited to ≥ 1 ms by a switching time. T1ρ measurement is a nice method to extend the range of field cycling, because it is possible to measure T1ρ values down to 10^-4 s. However sample heating can cause limitations. Using metallic lithium as a model system, this study shows that both methods compliment each other nicely and with certain limitations, can also be used to determine activation energies for Li-ionic jumps in solid-state ionic conductors.
(1)M Haaks et al., PBR, 2017, DOI:10.1103/PhysRevB.96.104301
(2)J. Gabriel et al., SSNMR, 2015, DOI:10.1016/j.ssnmr.2015.06.004