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

Schirmer, A.; Heitjans, Paul

doi:10.1515/zna-1995-0704

Cited by 17 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 The same is true for Ligraphite intercalation compounds (LiC 6 , LiC 12 ), where besides 7 Li, also the betaradioactive nucleus 8 Li (half-life 0.8 s) was used in studies by beta radiationdetected NMR (β-NMR). 9,[11][12][13][14] Concerning NMR studies of diffusion in nanocrystalline materials, the majority have up until now been done on ceramics, starting with an early work on 19 F in CaF 2 . 15 In nanocrystalline metals, very few investigations of diffusion by NMR have been reported, comprising studies on 63 Cu in copper, 16 27 Al in aluminum coated with Al 2 O 3 , 17 and 1 H in vanadium-hydrogen systems.…”

Section: Introductionmentioning

confidence: 99%

Ion Dynamics at Interfaces: Nuclear Magnetic Resonance Studies

Heitjans¹,

Wilkening²

2009

MRS Bull.

View full text Add to dashboard Cite

Interface engineering and the study of diffusion and transport processes through and along interfacial regions play important roles in materials science and energy research. For the latter, nanostructured materials are increasingly considered to act as powerful electrodes and solid electrolytes in sustainable energy systems, such as Li ion batteries. This is due to reduced diffusion lengths achieved when going to the nanometer scale and the fact that nanocrystalline materials with an average particle size of less than about 50 nm often show an enhanced diffusivity of their charge carriers. In this article, we show examples of how solid-state nuclear magnetic resonance (NMR) spectroscopy can be used to study the diffusion parameters of Li cations located in the interfacial regions separately from those in the interior of the grains. This article will demonstrate the future challenges and perspectives of Li NMR as a powerful tool of probing dynamic properties in functional materials.the topic here, were done on a larger variety of nanocrystalline ceramics with various NMR probe nuclei such as 6 Li (

show abstract

Section: Introductionmentioning

confidence: 99%

Ion Dynamics at Interfaces: Nuclear Magnetic Resonance Studies

Heitjans¹,

Wilkening²

2009

MRS Bull.

View full text Add to dashboard Cite

show abstract

“…Similar phenomena have been observed at low temperature, for example, in neutron activated 8 Li β-NMR of Li intercalated graphite, LiC 12 . 62,63 It is not clear why such motion would be absent in BTS, 5 which has a larger vdW gap than BSC (2.698 Å vs. 2.568 Å). Alternatively, this feature in the relaxation may have an electronic origin, perhaps related to the emergent low-T magnetism in MoTe 2 observed by µSR 64 and 8 Li β-NMR.…”

Section: A Dynamics Of the LI + Ionmentioning

confidence: 99%

Local electronic and magnetic properties of the doped topological insulators Bi$_{2}$Se$_{3}$:Ca and Bi$_{2}$Te$_{3}$:Mn investigated using ion-implanted $^{8}$Li $β$-NMR

McFadden,

Chatzichristos,

Cortie

et al. 2019

Preprint

View full text Add to dashboard Cite

We report β-detected nuclear magnetic resonance (β-NMR) measurements in Bi 2 Se 3 :Ca (BSC) and Bi 2 Te 3 :Mn (BTM) single crystals using 8 Li + implanted to depths on the order of 100 nm. Above ∼200 K, spin-lattice relaxation (SLR) reveals diffusion of 8 Li + , with activation energies of ∼0.4 eV (∼0.2 eV) in BSC (BTM). At lower temperatures, the nuclear magnetic resonance (NMR) properties are those of a heavily doped semiconductor in the metallic limit, with Korringa relaxation and a small, negative, temperature-dependent Knight shift in BSC. From this, we make a detailed comparison with the isostructural tetradymite Bi 2 Te 2 Se (BTS) [McFadden et al., Phys Rev. B 99, 125201 (2019)]. In the magnetic BTM, the effects of the dilute Mn moments predominate, but remarkably the 8 Li signal is not wiped out through the magnetic transition at 13 K, with a prominent critical peak in the SLR that is suppressed in a high applied field. This detailed characterization of the 8 Li NMR response is an important step towards using depth-resolved β-NMR to study the low-energy properties of the chiral topological surface state (TSS). With the bulk NMR response now established in several Bi 2 Ch 3 tetradymite topological insulators (TIs), the prospect of directly probing their chiral TSS using the depth resolution afforded by β-NMR remains strong.

show abstract

“…Although ion dynamics in this mixed-conducting compound has been investigated in the past via quasi-elastic neutron scattering (QENS) and NMR [54][55][56], for example we re-investigated ion self-diffusion by means of 7 Li spin-spin and spin-lock NMR relaxometry [32]. Whereas the laboratory 7 Li SLR NMR rates were strongly affected by the Li + -electron interactions in LiC 6 (see Figure 7a), the rates in the rotating frame of reference as well as the corresponding spin-spin relaxation rates were useful to extract diffusion parameters.…”

Section: Licmentioning

confidence: 99%

“…Li β-NMR on oriented LiC 6 crystals [54,55], and QENS [56] are shown in a joint Arrhenius plot. The Arrhenius line drawn is characterized by 0.55 eV; this activation energy agrees well with results from theory for both the in-plane vacancy and interstitial Li migration mechanism [57,58].…”

Section: Licmentioning

confidence: 99%

Solid-State NMR to Study Translational Li Ion Dynamics in Solids with Low-Dimensional Diffusion Pathways

Volgmann

Epp

Langer

et al. 2017

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

Fundamental research on lithium ion dynamics in solids is important to develop functional materials for, e.g. sensors or energy storage systems. In many cases a comprehensive understanding is only possible if experimental data are compared with predictions from diffusion models. Nuclear magnetic resonance (NMR), besides other techniques such as mass tracer or conductivity measurements, is known as a versatile tool to investigate ion dynamics. Among the various time-domain NMR techniques, NMR relaxometry, in particular, serves not only to measure diffusion parameters, such as jump rates and activation energies, it is also useful to collect information on the dimensionality of the underlying diffusion process. The latter is possible if both the temperature and, even more important, the frequency dependence of the diffusion-induced relaxation rates of actually polycrystalline materials is analyzed. Here we present some recent systematic relaxometry case studies using model systems that exhibit spatially restricted Li ion diffusion. Whenever possible we compare our results with data from other techniques as well as current relaxation models developed for 2D and 1D diffusion. As an example, 2D ionic motion has been verified for the hexagonal form of LiBH

show abstract

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

Cited by 17 publications

References 27 publications

Ion Dynamics at Interfaces: Nuclear Magnetic Resonance Studies

Ion Dynamics at Interfaces: Nuclear Magnetic Resonance Studies

Local electronic and magnetic properties of the doped topological insulators Bi$_{2}$Se$_{3}$:Ca and Bi$_{2}$Te$_{3}$:Mn investigated using ion-implanted $^{8}$Li $β$-NMR

Solid-State NMR to Study Translational Li Ion Dynamics in Solids with Low-Dimensional Diffusion Pathways

Contact Info

Product

Resources

About