Ion transport in glass: Influence of glassy structure on spatial extent of nonrandom ion hopping

Roling, Bernhard; Martiny, C.; Brückner, S.

doi:10.1103/physrevb.63.214203

Cited by 137 publications

(169 citation statements)

References 49 publications

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“…The Bode representation of the conductivities measured at temperatures in the range from −100 to 100°C show a plateau regime, where the conductivity σ′(ν) is identical to the bulk dc conductivity σ dc , reflecting long-range ion transport in the sample. 37 With the extracted values for σ dc , one can create the Arrhenius plot shown in Figure 10, according to the Arrhenius law: Here, A and E A denote the pre-exponential factor and the activation energy of the dc conductivity, respectively, while k B is Boltzmann's constant. The data fits very well to the Arrhenius law over the observed temperature range and the value of log A = 5.8 is typical for ionic conduction.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄

et al. 2012

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A new lithium chalcogenidotetrelate, denoted as LiChT phase, with the elemental combination Li/Sn/S was synthesized as solvent-free and solvent-containing salts. We present and discuss syntheses, crystal structures, spectroscopic and thermal properties of the phases, as well as the Li + ion conductivity of Li 4 SnS 4 , which is formally related to the thio-LISICON parent system Li 4 GeS 4 , and thus represents the first member of a new thiostannate-LISICON family. The solvent-free title compound shows a very promising Li + ion conductivity of 7 × 10 −5 S·cm −1 at 20°C and 3 × 10S·cm −1 at 100°C, which is exceptionally high for a ternary compound. Activation energies for the lithium ion transport measured via impedance spectroscopy (0.41 eV) correlate reasonably well with the values (0.29 to 0.33 eV) deduced from ionic mobility studies by 7 Li solid-state NMR spectroscopy. NMR two-time correlation functions suggest the occurrence of an additional, geometrically more restricted, ultraslow-motional process down to 121 K.

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Section: ■ Results and Discussionmentioning

confidence: 99%

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄

et al. 2012

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“…There is experimental evidence that in materials with high ion concentration, at any given time only part of the ions are actively involved in back-and-forth motion. 37,38 . A widely applied description of conductivity spectra in the low-frequency regime (i.e., below 100 MHz) is a Jonscher type power law,…”

Section: How To Define Mobile Ion Density?mentioning

confidence: 99%

“…In studies of alkali-germanate glasses and alkali-borate glasses of varying ion content, for instance, subtle changes in the shape of the conductivity spectra were seen to correlate to known anomalies in the glass-transition temperature. 37,38 The glass-transition temperature passes through a maximum as a result of how added modifier ions initially polymerize, but later depolymerize, the oxide network. Consequently, the average oxygen coordination of the ion's charge-compensating sites changes with ion concentration, resulting in modifications of the local ion environment which could mimic changes to the dimensionality of the conduction space.…”

Section: What Is the Role Of Dimensionality?mentioning

confidence: 99%

Fundamental questions relating to ion conduction in disordered solids

et al. 2009

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A number of basic scientific questions relating to ion conduction in homogeneously disordered solids are discussed. The questions deal with how to define the mobile ion density, what can be learned from electrode effects, what is the ion transport mechanism, the role of dimensionality, and what are the origins of the mixed-alkali effect, of time-temperature superposition, and of the nearly-constant loss. Answers are suggested to some of these questions, but the main purpose of the paper is to draw attention to the fact that this field of research still presents several fundamental challenges.

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“…The dynamics of ions in amorphous materials is very complex, as indicated, e.g., by the strong frequency dependence of the conductivity [1,2,3,4]. This frequency dependence directly reflects the presence of back-and forthdynamics of the individual ions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the complex ion dynamics in lithium silicate glasses via computer simulations

Heuer¹,

Kunow²,

Vogel³

et al. 2002

Phys. Chem. Chem. Phys.

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We present results of molecular dynamics simulations on lithium metasilicate over a broad range of temperatures for which the silicate network is frozen in but the lithium ions can still be equilibrated. The lithium dynamics is studied via the analysis of different correlation functions. The activation energy for the lithium mobility agrees very well with experimental data. The correlation of the dynamics of adjacent ions is weak. At low temperatures the dynamics can be separated into local vibrational dynamics and hopping events between adjacent lithium sites. The derivative of the mean square displacement displays several characteristic time regimes. They can be directly mapped onto respective frequency regimes for the conductivity. In particular it is possible to identify time regimes dominated by localized dynamics and longrange dynamics, respectively. The question of time-temperature superposition is discussed for the mean square displacement and the incoherent scattering function.

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Ion transport in glass: Influence of glassy structure on spatial extent of nonrandom ion hopping

Cited by 137 publications

References 49 publications

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄

Fundamental questions relating to ion conduction in disordered solids

Characterization of the complex ion dynamics in lithium silicate glasses via computer simulations

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Ion transport in glass: Influence of glassy structure on spatial extent of nonrandom ion hopping

Cited by 137 publications

References 49 publications

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li+-Conducting Tetralithium ortho-Sulfidostannate Li4SnS4

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li+-Conducting Tetralithium ortho-Sulfidostannate Li4SnS4

Fundamental questions relating to ion conduction in disordered solids

Characterization of the complex ion dynamics in lithium silicate glasses via computer simulations

Contact Info

Product

Resources

About

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄

New Lithium Chalcogenidotetrelates, LiChT: Synthesis and Characterization of the Li⁺-Conducting Tetralithium ortho-Sulfidostannate Li₄SnS₄