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Dynamics of Mobile Ions in Materials with Disordered Structures - the Case of Silver Iodide and the Two Universalities

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Encyclopedia of Applied Electrochemistry

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Introduction

In solid electrolytes that exhibit the key property of structural disorder, three types of nonvibrational motion of the mobile ions may be discerned. These are:

  1. 1.

    A “liquid-like” motion, as for instance in alpha silver iodide

  2. 2.

    A correlated hopping motion, which leads to macroscopic transport

  3. 3.

    A correlated localized motion, which creates the Nearly Constant Loss effect

By comparison, the situation is much simpler in ionic crystals with comparatively low degrees of disorder, in which the mobile point defects may be regarded as “random walkers.” An example of such a material is crystalline silver bromide at 200 °C [1].

The Case of Alpha Silver Iodide

In marked contrast to silver bromide, silver iodide in its high-temperature alpha phase, α-AgI, is structurally disordered, see below. It is indeed the archetypal fast ion conductor. The unexpected properties of α-AgI were discovered by C. Tubandt and E. Lorenz in 1914 [2], on the occasion of their measurements of the...

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Author information

Authors and Affiliations

  1. Institute of Physical Chemistry, University of Muenster, Muenster, Germany

    Klaus Funke

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  1. Klaus Funke
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Correspondence to Klaus Funke .

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Editors and Affiliations

  1. Eppstein, Germany

    Gerhard Kreysa

  2. Yokohama National University, Fac. Engineering, Yokohama, Japan

    Ken-ichiro Ota

  3. Case Western Reserve University, Cleveland, OH, USA

    Robert F. Savinell

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Funke, K. (2014). Dynamics of Mobile Ions in Materials with Disordered Structures - the Case of Silver Iodide and the Two Universalities. In: Kreysa, G., Ota, Ki., Savinell, R.F. (eds) Encyclopedia of Applied Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6996-5_474

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