Das system : Phasendiagramm und ionenleitung

Hruschka, Howard W.; Jansen, Martin

doi:10.1016/0025-5408(89)90204-3

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…The paddle wheel effect was first proposed by Kvist. et al for Li 2 SO 4 , followed by works on substituted Na 3 PO 4 , i.e., Na 3 PO 4 –Na 2 SO 4 solid solution, antiperovskite variants (NO 2 )ONa 3 , closo-borate, and others. − The migration barrier for sodium is lowered by the rotation of SO 4 tetrahedra, which propels sodium ions, as illustrated in Figure a . Such a mechanism is commonly observed in plastic and rotator phases, i.e., orientationally disordered phases (ODPs).…”

Section: Classical Understanding Of Ion Transport Mechanismsmentioning

confidence: 99%

Classical and Emerging Characterization Techniques for Investigation of Ion Transport Mechanisms in Crystalline Fast Ionic Conductors

et al. 2020

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Ion transport in crystalline fast ionic conductors is a complex physical phenomenon. Certain ionic species (e.g., Ag+, Cu+, Li+, F–, O2–, H+) in a solid crystalline framework can move as fast as in liquids. This property, although only observed in a limited number of materials, is a key enabler for a broad range of technologies, including batteries, fuel cells, and sensors. However, the mechanisms of ion transport in the crystal lattice of fast ionic conductors are still not fully understood despite the substantial progress achieved in the last 40 years, partly because of the wide range of length and time scales involved in the complex migration processes of ions in solids. Without a comprehensive understanding of these ion transport mechanisms, the rational design of new fast ionic conductors is not possible. In this review, we cover classical and emerging characterization techniques (both experimental and computational) that can be used to investigate ion transport processes in bulk crystalline inorganic materials which exhibit predominant ion conduction (i.e., negligible electronic conductivity) with a primary focus on literature published after 2000 and critically assess their strengths and limitations. Together with an overview of recent understanding, we highlight the need for a combined experimental and computational approach to study ion transport in solids of desired time and length scales and for precise measurements of physical parameters related to ion transport.

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Section: Classical Understanding Of Ion Transport Mechanismsmentioning

confidence: 99%

Classical and Emerging Characterization Techniques for Investigation of Ion Transport Mechanisms in Crystalline Fast Ionic Conductors

et al. 2020

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Volumeneffekt oder Drehtürmechanismus ‐ schnelle Alkalimetall‐Ionenleitung in Festkörpern mit rotationsfehlgeordneten komplexen Anionen

Jansen¹

1991

Angewandte Chemie

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Volume Effect or Paddle‐Wheel Mechanism—Fast Alkali‐Metal Ionic Conduction in Solids with Rotationally Disordered Complex Anions

Jansen

1991

Angew. Chem. Int. Ed. Engl.

156

171

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Dedicated to Professor Karl Heinz Buchel on the occasion of his 60th birthday Transport phenomena in the solid state are of equal importance in basic research and practice. In the past two decades particular interest has been directed towards so-called "fast" or "super" ionic conductors because of their attractive potential applications. We have synthesized highly conductive alkali-metal ionic conductors based on ionic crystals in which, on the one hand, high concentrations of the charge carriers can be realized by doping (point defects in the cation substructure) and, on the other, the activation energy of the interchange of sites is decreased by translationally fixed but rotationally mobile complex anions. Mixed crystals with Na,PO, or Na,AIF, structures have proven especially suitable in this connection. With the object of establishing a broader experimental foundation for clarifying the controversially discussed question of whether the higher free transport volume or the rotational motion of the anions is responsible for the high cation mobility in these rotary phases we have systematically varied the type of anions and concentration of defects and monitored the resulting changes in conduo tivity. Although the macroscopical characteristics investigated are not suitable for explaining mechanisms in detail at the atomic level, the results afford clear support for the assumption of a "paddle wheel mechanism"; but also effects of the enlarged transport volume are not to be disputed. Both these effects enhancing the cationic conductivity are concomitantly operative in amounts varying from system to system; they cannot be totally separated from each other.

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Das system : Phasendiagramm und ionenleitung

Cited by 5 publications

References 3 publications

Classical and Emerging Characterization Techniques for Investigation of Ion Transport Mechanisms in Crystalline Fast Ionic Conductors

Classical and Emerging Characterization Techniques for Investigation of Ion Transport Mechanisms in Crystalline Fast Ionic Conductors

Volumeneffekt oder Drehtürmechanismus ‐ schnelle Alkalimetall‐Ionenleitung in Festkörpern mit rotationsfehlgeordneten komplexen Anionen

Volume Effect or Paddle‐Wheel Mechanism—Fast Alkali‐Metal Ionic Conduction in Solids with Rotationally Disordered Complex Anions

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