Dynamical structure of AgxCu1-xI (x=0.99–0.80) in ionic and superionic phases studied by solid 63Cu and 127I NMR spin–lattice relaxation time measurements

127I and 207Pb Solid-State NMR Spectroscopy and Nuclear Spin Relaxation in PbI2: A Preliminary Study

“…The most likely interpretation of the thermally activated mechanism is that it is associated with modulation of electric field gradients due to the hopping of iodine atoms throughout the lattice. A combination of these two relaxation mechanisms has been previously reported for 127 I relaxation in Ag x Cu 1– x I. , By this model, the van Kranendonk mechanism is approximately 100 times more efficient for 127 I in PbI 2 than it is for the Ag x Cu 1– x I compounds, and the activation energy for the thermally activated process in PbI 2 is substantially lower than for Ag x Cu 1– x I, indicating a difference in the effectiveness of the two relaxation mechanisms in the two materials.…”

Lithium insertion in hard carbon as observed by 7Li NMR and XRD. The local and mesoscopic order and their relevance for lithium storage and diffusion

“…Therefore, the activation energy inferred from spin relaxation as shown in Fig. 4 is often significantly lower (though never higher) 66–74 than that inferred from the temperature dependence of the self-diffusion coefficient or ionic conductivity. For LiC 6 , the difference between these two activation energies was roughly a factor of 2.…”

Solid-State Nuclear Magnetic Resonance

“…T 1 measurements of the sodium resonance in sodium orthophosphate and solids solutions of it with added sulfate are interpreted in terms of correlated anion reorientation and cation diffusion (69). Relaxation of 63 Cu and 127 I centers in ionic and superionic conductors appears to be due to thermally generated defects, whose energy of activation for diffusion and enthalpy of formation were determined from the NMR properties (70).…”