Ionic diffusion and structural changes in lithium compounds

Nakamura, Kōichi; Hirano, Hiroshi; Nishioka, Daisuke; Endou, Shigeki; Itsuki, Kazuya; Michihiro, Yoshitaka; Moriga, Toshihiro; Kuwata, Naoaki; Kawamura, Junichi

doi:10.1016/j.ssi.2008.10.024

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…While no appreciable signals were observed without sample spinning, disk MAS revealed a center peak at 0 ppm and a number of spinning sidebands. Considering the similar profile of the spinning side-bands reported in 7 Li MAS NMR of LiCoO 2 in the paramagnetic state [16][17][18], a part of the diamagnetic Co 3+ ions in the LiCoO 2 thin film have presumably changed into paramagnetic Co 2+ ions. In the disk MAS spectrum, the dipolar couplings between the 7 Li spins and the Co 2+ ions were partially averaged by sample spinning, while in the static spectrum the resonance line was broadened and obscured.…”

supporting

confidence: 62%

Nondestructive high-resolution solid-state NMR of rotating thin films at the magic-angle

Inukai

Noda

Takeda

2011

Journal of Magnetic Resonance

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We present a new approach to nondestructive magic-angle spinning (MAS) nuclear magnetic resonance (NMR) for thin films. In this scheme, the sample put on the top of a rotor is spun using the conventional MAS system, and the NMR signals are detected with an additional coil. Stable spinning of disk-shaped samples with diameters of 7 mm and 12 mm at 14.2 and 7 kHz are feasible. We present 7Li MAS NMR experiments of a thin-film sample of LiCoO2 with a thickness of 200 nm. Taking advantage of the nondestructive feature of the experiment, we also demonstrate ex situ experiments, by tracing conformation change upon annealing for various durations. This approach opens the door for in situ MAS NMR of thin-film devices as well.

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supporting

confidence: 62%

Nondestructive high-resolution solid-state NMR of rotating thin films at the magic-angle

Inukai

Noda

Takeda

2011

Journal of Magnetic Resonance

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“…The quadrupole coupling constant C Q (= e 2 qQ/h) of ALN125 is estimated to be about 65.2 kHz, which is close to that of around 67 kHz for poly-LN. [10,15] The asymmetric parameter The characteristic static NMR spectrum of ALN5 suggests that there are two kinds of the state of motion of Li + ions. In this case, the measured spectrum of Fig.…”

Section: Resultsmentioning

confidence: 99%

7Li NMR study of milling effects on instability of lithium-sites in lithium substituted silver niobate

et al. 2014

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Site occupation and structural change in Li substituted AgNbO 3 were probed by 7 Li NMR. Characteristic changes in the 7 Li NMR spectra depending on Li content were observed. Analysis of integrated intensity of the spectra revealed that 16 % of substituted Li + ions occupy quasi-stable sites induced in crystal structure at 300 K in the 5 mol.% Li substituted sample and would be in the state of motion, which are comparable to that of Li + ion in LiNbO 3 at high temperature. On the other hand, it was found that the Li + /Ag + sublattice in the 12.5 mol.% Li substituted sample is easily made unstable by structural disturbance introduced in structure and instability of the sublattice stimulates a local Li + ion motion via quasi-stable sites at room temperature. An appearance of the quasi-stable sites in local structure due to the Li substitution is closely related to instability of the Li/Ag sublattice and Li + ion dynamics in Li substituted AgNbO 3 .

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