Ionic conductivity glasses

Fig. 4.1 Arrhenius plots for ionic conductivity, (a) General behaviour for ionically conducting glasses. At room temperature, the most conductive (Li or Ag ) have the lowest activation energy. For the less conductive glasses (Cs or mixed alkali glasses) the activation energy is around 1 eV. (b) Experimental data for Li conducting glasses (Souquet and Kone, 1986).

The glassy systems mentioned in Figs. 4.1(h) and 4.2 show that quite complex chemical compositions have been prepared in the glassy state. Up to three basic constituents are present in all ionically conducting glasses network formers, network modifiers and ionic salts, in different proportions. 

Re-expressing the earlier definition (equation 7.06) of s for an ionically conducting glass, using 8 to represent the frequency independent dielectric constant and a(0) the conductivity. 

Bamford, D., Reiche, A., Dlubek, G., Alloin, F., Sanchez, J.-Y., and Alam, M. A., Ionic conductivity, glass transition and local free volume in poly(ethylene oxide) electrolytes single and mixed ion conductors, J. Chem. Phys., 118,9420-9432 (2003). 

An alternative approach, used to describe the properties of ionically conducting glasses, is conceptually closely related to the earlier discussion of transport properties in materials with a small number of sublattices for the conducting species. 

Okura, T Monma, H Yamashita, K. (2010). Na+-fast ionic conducting glass-ceramics of silicophosphates. /. Ekctroceram., 24,83-90. 

Semiconducting glasses exhibit electronic rather than ionic conductivity. Glasses with resistivities in the range of 10 to 10 ohm-cm have been reported in the Ge-P-V oxide system and in the elemental glasses of either S, Se, or Te combined with one or more of the elements Si, Ge, P, As, Th, and Pb. Electronic devices are described that use semiconducting glasses as the solid-state switch or memory component. ... 

Ngai K L (1996) A review of critical experimental facts in electrical relaxation and ionic diffusion in ionically conducting glasses and melts, J Non-Cryst Solids 203 232-245. 

One-dimensional conductors with conduction channels parallel to each other, as realized in the hoUandite structure in Fig. 6.11, are essentially of academic interest. Generally the conductivity depends very strongly on the specific structural environment. This also applies to ionically conducting glasses and polymers. Polar... 

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