Li Diffusion in Stage 2 Li-Graphite Intercalation Compounds Studied with Quasielastic Neutron Scattering

Kim, H. J.; Magerl, A.; Fischer, J. E.; Vaknin, David; Heitjans, Paul; Schirmer, A.

doi:10.1007/978-1-4615-2850-0_38

Cited by 7 publications

(9 citation statements)

References 6 publications

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“…For LiC12 the TOF spectra yield an activation en ergy £ a = 0.35 eV [34]. This is considerably lower than the EA value of about 1 eV estimated from the jS-NMR data.…”

Section: Diffusivity In Stage-1 and Stage-2mentioning

confidence: 59%

“…In backscattering measurements on LiC12 no broadening of the quasielastic line was observed but a decrease of the elastic intensity / integrated over the instrumental resolution as the temperature was raised from T= 50 K to T> 600 K [34], The elastic intensity in these fixed-window scans decreases due to the re duction of the Debye-Waller factor and the onset of motional processes in the frequency window of the instrumental resolution. In the fixed-window scans of LiC12 and LiC16 the former results in a weak decrease with T already at low temperatures.…”

Section: Quasielastic Line Broadening Of Sinc (Qoj)mentioning

confidence: 89%

“…For LiC16 / close to the in-plane distance 0.25 nm of hexagon centres, i.e. the distance from a Li site to the site in the centre between adjacent carbon hexagons [34].…”

Section: Quasielastic Line Broadening Of Sinc (Qoj)mentioning

confidence: 99%

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Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Schirmer

Heitjans

1995

Zeitschrift Für Naturforschung A

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Dedicated to Professor Werner Müller-Warmuth on the occasion of his 65th birthdayInvestigations of Li diffusion in stage-1 and stage-2 Li graphite intercalation compounds with neutron time-of-flight and backscattering techniques and ^-radiation detected nuclear magnetic resonance/relaxation (/J-NMR) with the nucleus 8Li(T1/2 = 0.8 s) are reviewed and compared. De pending on temperature, the spin-lattice relaxation-rate T{1 of 8Li is governed by different pro cesses. Above 300 K, T f1 (T) shows maxima induced by long-range Li+ diffusion. Jump correlation times are estimated. Inspection of the B field dependence of T f1 revealed two-dimensional diffusion behaviour. The neutron spectra showed a quasielastic line broadening above 500 K, which was used to obtain diffusion coefficients and to trace jump vectors of the in-plane motion. The diffusion parameters observed with both techniques are compared, and differences that show up are dis cussed. In addition, the low-temperature spin-lattice relaxation rates, being due to coupling to conduction electrons, are used to explore electronic properties.

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“…For LiC12 the TOF spectra yield an activation en ergy £ a = 0.35 eV [34]. This is considerably lower than the EA value of about 1 eV estimated from the jS-NMR data.…”

Section: Diffusivity In Stage-1 and Stage-2mentioning

confidence: 59%

Section: Quasielastic Line Broadening Of Sinc (Qoj)mentioning

confidence: 89%

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Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Schirmer

Heitjans

1995

Zeitschrift Für Naturforschung A

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“…It enables the determination of, on one hand, the overall diffusion coefficient and, on the other, the study of the single elementary atomic jump process. So far, numerous interesting studies have been carried out on the diffusion of hydrogen in metals, in intercalation compounds, and in solid state proton conductors. , Despite the ability of QENS to directly observe microscopic oxygen diffusion dynamics, the investigation of oxide ion conductors using this technique has so far only been reported in a few studies and on timescales of picoseconds − to hundreds of picoseconds. , …”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Oxide Ion Dynamics in La₂Mo₂O₉ on the Nanosecond Timescale

et al. 2017

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Quasielastic neutron scattering (QENS), underpinned by ab-initio molecular dynamics (AIMD) simulations, has been used to directly observe oxide ion dynamics in solid electrolyte La 2 Mo 2 O 9 on the nanosecond timescale, the longest timescale probed in oxide ion conductors by neutron scattering to date. QENS gives the activation energy of 0.61(5) eV for this process, while AIMD simulations reveal that the exchange processes, which ultimately lead to long-range oxide ion diffusion in La 2 Mo 2 O 9 , rely on the flexibility of the coordination environment around Mo 6+ , with oxide ions jumps occurring between vacant sites both within and between Mo coordination spheres. Simulations also differentiate between the crystallographic sites which participate in the oxide ion exchange processes, offering the first atomic-level understanding of the oxide ion dynamics in La 2 Mo 2 O 9 , which is consistent with the macroscopic experimental observations on this material.

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“…In other words, dierent setups or methods might show a dierent sensitivity in addressing each of the two diusion pathways. Indeed, techniques such as quasi-elastic neutron scattering (QENS), which are sensitive mainly to the in-plane diusivity, report high values of the Li self-diusion coecient D at considerable composition of x ≥ 0.375,188,189 albeit measured at several 100 K above room temperature where D is further enhanced. Jungblut & Hoinkins 190 also report…”

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confidence: 99%

Lithium Intercalation in Bilayer Graphene Devices

Kühne¹

2018

Springer Theses

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Bibliography Nyquist scattering time τq quantum lifetime τtr transport time θ contact angle U voltage UG gate voltage UOCV open circuit voltage Uxx, Uxy longitudinal and transverse voltage drop v, vD drift velocity vF Fermi velocity W width ξ valley index vi * Although higher values of |∆n| have successfully been achieved by this method, dielectric breakdown remains a fundamental limit to eld eect gating, making it dicult to reach values beyond |∆n| = 10 13 cm −2 .

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Li Diffusion in Stage 2 Li-Graphite Intercalation Compounds Studied with Quasielastic Neutron Scattering

Cited by 7 publications

References 6 publications

Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Direct Observation of Oxide Ion Dynamics in La₂Mo₂O₉ on the Nanosecond Timescale

Lithium Intercalation in Bilayer Graphene Devices

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Li Diffusion in Stage 2 Li-Graphite Intercalation Compounds Studied with Quasielastic Neutron Scattering

Cited by 7 publications

References 6 publications

Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Diffusive Motion in Stage-1 and Stage-2 Li-Graphite Intercalation Compounds: Results of ß-NMR and Quasielastic Neutron Scattering

Direct Observation of Oxide Ion Dynamics in La2Mo2O9 on the Nanosecond Timescale

Lithium Intercalation in Bilayer Graphene Devices

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Direct Observation of Oxide Ion Dynamics in La₂Mo₂O₉ on the Nanosecond Timescale