Unusual lithium dynamics and NMR relaxation in a novel crystalline thioborate-sulfide

Li6andLi7NMR line-shape and stimulated-echo studies of lithium ionic hopping inFaske1, Eckert2, Vogel3 2008Phys. Rev. B606690View full textAdd to dashboardCite

“…13,16 Thus, the formula of Waugh and Fedin underestimates the activation energy of the motional process, consistent with results in the literature. 64 Equation ͑4͒ allows us to relate the 7 Li linewidths to the correlation times LS . Here, we choose the fit parameter ␣ = 1 and use ⌬ 0 = 3900 Hz and ⌬ ϱ = 320 Hz from the lowand high-temperature limits, respectively.…”

“…Such deviations have been observed in several NMR line-shape studies of ionic motion in solid electrolytes. 57,[64][65][66] Most likely, they are due to the fact that the line-shape analysis methods rely on the inherent assumption of an exponentially decaying correlation function, while the ionic jumps are characterized by strongly nonexponential correlation functions. We conclude that NMR line-shape analysis does not yield reliable correlation times of ion dynamics in glasses.…”

Solid-state Li NMR with applications to the translational dynamics in ion conductors

“…Some other crystals with disorder in the immobile sublattice. Another group of crystalline materials with disorder in the sublattice of the immobile ions that has been studied by 7 Li NMR are the lithium thioborates such as Li 5 B 7 S 13 [313,314] and Li 9 B 19 S 33 [315]. Nb 3 Se 4 is an insertion compound with one-dimensional channels.…”

Bor-Schwefel- und Bor-Selen-Verbindungen – von Prinzipien einzigartiger Molekülstrukturen zu neuartigen Polymermaterialien

“…In Li 3 Na 5 B 10 S 19 [61] und Li 4À2x Sr 2x B 10 S 19 (x % 0.27) [71] liegen B 10 S 18 S 2/2 -Ketten vor (Abb. 8), während in Na 6 B 10 S 18 , [71] Li 62x [B 10 S 18 ]S x (x % 2) [72,74] und Ag 6 B 10 S 18 [75] alle Ecken von B 10 S 16 S 4/2 -Makrotetraedern mit benachbarten Einheiten verknüpft sind, so daû zwei sich gegenseitig durchdringende, dreidimensional-unendliche Netze entstehen (Abb. 8).…”

“…Diese Verbindungen sind Modellsysteme zur Untersuchung der Transportmechanismen der Ionenleitung. In Zusammenarbeit mit der Arbeitsgruppe von Müller-Warmuth wurden 7 Li-NMR-Experimente mit den Verbindungen Li 5 B 7 S 13 , [72] Li 9 B 19 S 33 , [86] Li 4À2x Sr 2x B 10 S 19 (x % 0.27) [86] und Li 62x [B 10 S 18 ]S x (x % 2) [72,73] durchgeführt. Die Spektrenentwicklung ähnelt der von glasartigen Thioboraten.…”