Secondary Relaxation Processes in Molecular Glasses Studied by Nuclear Magnetic Resonance Spectroscopy

NMR Multi-Time Correlation Functions of Ion Dynamics in Solids

“…The experimental 3T-CF was compared with the predictions for purely homogeneous dynamics (F hom 3 ) and purely heterogeneous dynamics (F het 3 ), which were calculated using Eqs. (8) and (9). While F hom 3 substantially deviates from the experimental data, F het 3 agrees with the measured decay, expect for minor deviations at short times.…”

“…This approach allows one to correlate the positions of an ion, more precisely, the resonance frequencies of the nucleus associated with the ion, at two, three, or four points in time, enabling detailed insights into the nature of the ionic jump motion [1,9]. Here, we present results from 6 Li, 7 Li, and 109 Ag NMR stimulated-echo studies on various lithium-or silver-ion conducting crystals and glasses to demonstrate this potential.…”

“…Recently, NMR MT-CF proved very useful to study ion dynamics in solid and polymer electrolytes [1,[9][10][11]. When the height of the echo after the stimulated-echo pulse sequence is measured for various t m and constant t p , twotime correlation functions (2T-CF) can be obtained.…”

“…F 3 (t m3 ) was recorded using a filter time of t f = 2 × 10 −2 s. The experimental 3T-CF is compared with expectations for purely homogeneous dynamics (F hom 3 ) and for purely heterogeneous dynamics (F het 3 ), see Eqs. (8) and (9). Exact restoration of the resonance frequency was assumed in the calculations, as indicated by the finite residual correlation of the 2T-CF.…”

Combining 7Li NMR field-cycling relaxometry and stimulated-echo experiments: A powerful approach to lithium ion dynamics in solid-state electrolytes

“…Then, motional narrowing is not continuous, but it involves spectra that can be described as a weighted superposition of a narrow component and a broad component, reflecting the fast and slow ions from the distribution, respectively [3,[16][17][18][19][20].…”