TL;DR: The main feature of this area of science and emerging technology is the rapid transport of atomic or ionic species within solids, and various phenomena, of both scientific and technological interest, that are related to it as discussed by the authors.
Abstract: This issue of the MRS BULLETIN contains three articles relating to the general field that has come to be known as Solid State Ionics. The central feature of this area of science and emerging technology is the rapid transport of atomic or ionic species within solids, and the various phenomena, of both scientific and technological interest, that are related to it.Attention to this area has grown greatly in recent years because of the rapidly increasing recognition of the possibility of a wide range of interesting technological applications. One example already widespread is the use of an oxygen-conducting solid electrolyte as the critical element in the oxygen sensors installed in the exhaust systems of almost all current automobiles to reduce deleterious emissions and improve the efficiency of the combustion process.Work is under way in a number of other directions, including static and dynamic chemical sensors, solid state electrochemical reactors, low impedance selective atomic filters, new concepts for the direct conversion of heat to electricity by the use of sodium- or hydrogen-transporting cycles, a novel method for the low cost electrolysis of water at intermediate temperatures, batteries that can store greatly increased amounts of energy, ion exchange materials, solid state laser hosts, high efficiency fuel cells, electrochromic materials and configurations for both optical displays and “smart windows,” advanced catalysts, atomic reservoirs and pumps, high temperature superconductors, and possibly solid state fusion hosts.Despite this recent attention, however, it is worth noting that interest in solids in which ionic species can move with unusual rapidity is actually not new at all. As early as 1839, Michael Faraday reported measurements on several materials that showed an unusual increase in electrical conductivity at elevated temperatures, contrary to that found in normal metals.
TL;DR: In this paper, the authors present the experimental status of solid state ionics (SSI), and discuss the major contributions of SSI to technology in the past, present and future.
Abstract: Preface. 1. New routes in the development of chemical sensors: surface devices S. Pizzini. 2. Materials and concepts for solid state electrochemical devices W. Weppner. 3. Optical properties of transition-metal and rare earth ions in beta aluminas G. Mariotto. 4. Intercalation compounds M.S. Whittingham. 5. Polymer electrolytes and intercalation electrodes: fundamentals and applications P.G. Bruce. 6. Is there a future for lithium-batteries as high energy density source in electrical engine vehicles? Some recent trends C. Delmas, I. Saadoune, H. Auradou, M. Menetrier, P. Hagenmuller. 7. Ion mobility in chalcogenide semiconductors Room temperature creation of bipolar junction transistor D. Cahen, L. Chernyak, G. Dagan, A. Jakubowicz. 8. Mixed conductors for negative electrodes R.A. Huggins. 9. Surface oxygen exchange kinetics of solid oxide ion condutors B.A. Boukamp, I.C. Vinke, K.J. De Vries, A.J. Burggraaf. 10. Ionic conduction in sulphates A. Lunden. 11. Copper solid electrolyte-copper(I) halide and alkali halide systems O. Yamamoto. 12. Ionic conduction in glasses A. Magistris. 13. Chemical vapor deposition techniques for thin films of solid electrolytes and electrodes V.E.J. van Dieten, J.P. Dekker, A.A. van Zomeren, J. Schoonman. 14. Silver solid state energy storage devices B.B. Owens. 15. Bismuth-based oxide conductors novel structural and electrical features G. Mairesse. 16. Anisotropy in the ionic conductivity of K3NdSi3O8(OH)2 S.M. Hale, J. Maier, B.J. Wuensch, R.A. Laudise. 17. Peculiarities in the low temperature ion and electron conductivity of solid oxide eletrolytes H. Nafe. 18. Chemical analysis and structural investigations of sodium and lanthanide ion-exchanged beta-aluminas F. Tietz, W. Urland. 19. Electrical releaxation in polymer electrolytes I. Albinsson, B.-E. Mellander. 20. Quadrupole-broadened NMR-MAS spectra of disordered materials: acquisition and analysis P. Mustarelli. 21. Experimental working group report: What is the experimental status of solid state ionics (SSI)? R.J. Nowak, E. Zanghellini, H. Nafe, V. van Dieten. 22. Experimental working group report: What are the major contributions of solid state ionics to technology in the past and future? J.S. Lunsgaard, C. Arbizzani, M. Gina, T. Kawada, J. Lane. Final remarks W. van Gool.
TL;DR: In this article, a range of organic ionic compounds that exhibit ion conduction at room temperature is described, including the plastic crystal phase with a small ion such as Li+ in some cases producing an even higher conductivity.
Abstract: Plastic crystal materials have long been known but have only relatively recently become of interest as solid–state ion conductors. Their properties are often associated with dynamic orientational disorder or rotator motions in the crystalline lattice. This paper describes recent work in the field including the range of organic ionic compounds that exhibit ion conduction at room temperature. Conductivity in some cases is high enough to render the compounds of interest as electrolyte materials in all solid state electrochemical devices. Doping of the plastic crystal phase with a small ion such as Li+ in some cases produces an even higher conductivity. In this case the plastic crystal acts as a solid state “solvent” for the doped ion and supports the conductive motion of the dopant via motions of the matrix ions. These doped materials are also described in detail.
TL;DR: A review of the evolution of solid-state ionics over approximately the past 100 years is given in this article, with a brief history, introducing milestones of the development of this discipline, followed by a short summary of the theory of ionic conduction in the bulk and the more recently developed theory at interfaces, and the main technological applications, that is, batteries, solidoxide fuel cells, electrochemical sensors, electrochromic windows, and oxygen-separation membranes.
Abstract: This review represents the authors' view of the evolution of solid-state ionics over approximately the past 100 years. A brief history, introducing milestones of the development of this discipline, is followed by a short summary of the theory of ionic conduction in the bulk and the more recently developed theory of ionic conduction at interfaces. The central part of the article gives examples of ionic-conducting materials systems with structures ranging from one- to three-dimensional disorder. Important experimental techniques for analyzing ionic conduction, including alternating-current impedance spectroscopy, direct-current coulometry, and direct-current current-voltage measurements with blocking electrodes, are also summarized. The main technological applications, that is, batteries, solid-oxide fuel cells, electrochemical sensors, electrochromic windows, and oxygen-separation membranes, are reviewed. Finally, new concepts in solid-state ionics are presented, including the investigation of new materials (such as nanostructured phases), the study of boundaries (for example, using microelectrodes), the development of computational techniques, and the connections with other classes of materials (notably magnetic and semiconducting materials).
TL;DR: In this article, the Gerischer impedance in its most elementary form, ZG(ω)=Z0(k+jω)−1/2, has been observed in the frequency response of mixed conducting solid electrolyte systems.