Topic
Ionic conductivity
About: Ionic conductivity is a research topic. Over the lifetime, 19412 publications have been published within this topic receiving 519167 citations.
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TL;DR: In this article, the relationship between structure and conductivity for two apatite-type phases, La 9.33 Si 6 O 26 and La 8 Sr 2 Si 6O 26, was investigated.
271 citations
01 Jan 1979
TL;DR: In this article, the authors proposed a model for superionic conductors based on EXAFS, and showed that the model can be extended to other superionic properties, such as high frequency and low frequency.
Abstract: 1. Introduction.- References.- 2. Structure and Its Influence on Superionic Conduction: EXAFS Studies.- 2.1 Technique of EXAFS.- 2.1.1 Theory.- 2.1.2 Experiment.- 2.1.3 Data Reduction and Analysis.- 2.1.4 Contrast with Diffraction Studies.- 2.2 Structural Considerations for Superionic Conduction.- 2.2.1 General Considerations.- 2.2.2 Pair Potentials.- 2.2.3 Anharmonic Model.- 2.2.4 Excluded Volume Model and Cation-Anion Correlations.- 2.3 EXAFS Investigations of bcc Superionic Conductors: AgI.- 2.3.1 Early Structural Studies.- 2.3.2 EXAFS Study.- 2.3.3 Other Recent Structural Studies.- 2.3.4 Structural Model for Superionic Conduction in bcc Conductors.- 2.4 EXAFS Investigations of fcc Superionic Conductors: Cuprous Halides.- 2.4.1 CuI Structural Studies.- 2.4.2 EXAFS and Structural Models for CuI.- 2.4.3 CuBr.- 2.4.4 CuCl.- 2.4.5 Discussion.- 2.5 Summary.- References.- 3. Neutron Scattering Studies of Superionic Conductors.- 3.1 Neutron Scattering.- 3.1.1 Scattering function.- 3.1.2 Elastic Scattering.- 3.1.3 Inelastic Scattering.- 3.2 Structural Studies.- 3.2.1 AgI.- 3.2.2 Fluorites.- 3.2.3 ?-Alumina.- 3.3 Inelastic Studies.- 3.3.1 AgI.- 3.3.2 RbAg4I5.- 3.3.3 Fluorites.- 3.3.4 ?-Alumina.- 3.4 Conclusions.- References.- 4. Statics and Dynamics of Lattice Gas Models.- 4.1 General Theory of the Lattice Gas Model for Superionic Conductors.- 4.1.1 Definition of the Lattice Gas Model.- 4.1.2 Liouvillian Approach to Lattice Gas Dynamics.- 4.1.3 Master-Equation Approximation.- 4.1.4 High-Frequency Limit.- 4.1.5 Extension to All Frequencies.- 4.2 Extended Dynamical Theory.- 4.2.1 ?trap and Its Relation to a Soliton Model.- 4.2.2 Low-Frequency Conductivity.- 4.3 Applications to Silver Iodide and Hollandite.- 4.3.1 Silver Iodide: Structural Properties, Lattice Gas Representation.- 4.3.2 The Disorder Entropy of AgI.- 4.3.3 Dynami c Properties of ?-AgI.- 4.3.4 Collective Excitations in One-Dimensional Systems: Hollandite.- 4.4 Conclusions.- Appendix A.- Appendix B.- Appendix C.- References.- 5. Light Scattering in Superionic Conductors.- 5.1 Raman Scatteri ng.- 5.1.1 Silver Iodide.- 5.1.2 M+Ag4I5 (M+ = Rb+, K+, NH+4).- 5.1.3 Copper Halides.- 5.1.4 ?-Aluminas.- 5.1.5 Anion Conducting Fluorites.- 5.2 Low-Frequency Raman and Brillouin Scattering.- 5.2.1 Theoretical Considerations.- 5.2.2 Silver Halides.- 5.2.3 Other Superionic Conductors.- 5.3 Infrared Absorption and Frequency Dependent Conductivity.- 5.4 Conclusion.- References.- 6. Magnetic Resonance in Superionic Conductors.- 6.1 Theory of NMR Relaxation of and by Rapidly Diffusing Ions.- 6.1.1 General Correlation Functions and Interactions.- 6.1.2 Calculation of T1 and T2 from Correlation Functions.- 6.1.3 T1/T2 Ratio.- 6.1.4 Simple Random-Walk Values.- 6.1.5 Diffusion in Lower Dimensions.- 6.1.6 Effects of Correlated Hopping.- 6.2 Comparison with Experiment.- 6.2.1 Thermal Activation.- 6.2.2 Frequency Dependence.- 6.2.3 Prefactors.- 6.2.4 Coupling to Paramagnetic Impurities.- 6.3 Electron Paramagnetic Resonance.- 6.4 Structure Determination.- 6.5 Summary and Conclusions.- References.- 7. Phase Transitions in Ionic Conductors.- 7.1 Modern Theory of Phase Transitions.- 7.1.1 Landau Criteria.- 7.1.2 Renormalization Group.- 7.2 Models for Critical Behavior in Superionic Conductors.- 7.2.1 Quasi-Chemical Models.- 7.2.2 Lattice Gas Models.- 7.2.3 The Order Parameter for RbAg4I5.- 7.3 Critical Behavior of Physical Properties.- 7.3.1 Specific Heat.- 7.3.2 Ionic Conductivity.- 7.3.3 Acoustic Properties.- 7.3.4 Other Properties.- 7.4 Conclusions.- References.- 8. Continuous Stochastic Models.- 8.1 Models for Superionic Conductors.- 8.1.1 The Hamiltonian.- 8.1.2 Comparison of the Models from Microscopic Considerations.- 8.1.3 Correlation Functions.- 8.2 Continuous Models.- 8.2.1 Langevin Equation.- 8.2.2 Fokker-Planck Equation and Liouvillian.- 8.2.3 Continued-Fraction Expansion.- 8.2.4 Static Mobility, Diffusion Constant, dc Conductivity.- 8.2.5 Dynamic Mobility, ac Conductivity.- 8.2.6 Approximate Solutions and Similar Models.- 8.2.7 Dynamic Structure Factor for Jump Diffusion.- 8.2.8 Dynamic Structure Factor for Large Friction.- 8.2.9 Dynamic Structure Factor for General Friction.- 8.2.10 Light Scattering: Continuous and Continuum Models.- 8.2.11 Microscopic Foundation.- 8.3 Computer Simulations.- 8.4 Correlations Among the Mobile Ions.- References.- Additional References with Titles.
271 citations
TL;DR: In this article, the ionic conductivity and electrochemical intercalation properties of La 2 3−x Li 3 x TiO 3 solid solutions (for 0.07 ≤ x ≤ 0.13) have been studied.
271 citations
TL;DR: It is found that the hydrogen bonds are weaker than expected, as indicated by their short lifetimes, which is due to the fast rotational motion of anions, and this deviation results from the correlated motion of cations and anions over time scales up to nanoseconds.
Abstract: Molecular dynamics simulations with an all-atom model were carried out to study the ionic liquid 1-n-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6]. Analysis was carried out to characterize a number of structural and dynamic properties. It is found that the hydrogen bonds are weaker than expected, as indicated by their short lifetimes, which is due to the fast rotational motion of anions. Transport properties such as ion diffusion coefficients and ionic conductivity were also measured on the basis of long trajectories, and good agreement was obtained with experimental results. The phenomenon that electrical conductivity of ionic liquids deviates from the Nernst−Einstein relation was well reproduced in our work. On the basis of our analysis, we suggest that this deviation results from the correlated motion of cations and anions over time scales up to nanoseconds. In contrast, we find no evidence for long-lived ion-pairs migrating together.
270 citations
TL;DR: In this article, an inorganic solid electrolyte was shown to have an exceptionally high ionic conductivity of 25 mS cm−1, which allows a solid-state battery to deliver 70% of its maximum capacity in just one minute at room temperature.
Abstract: Materials with high ionic conductivity are urgently needed for the development of solid-state lithium batteries. Now, an inorganic solid electrolyte is shown to have an exceptionally high ionic conductivity of 25 mS cm−1, which allows a solid-state battery to deliver 70% of its maximum capacity in just one minute at room temperature.
270 citations