Survey of solid electrolytes general comments

Solid electrolyte behaviour has been reported in a wide range of materials and is now known for a considerable number of mobile ions. Some key examples for each ion are listed in Table 2.1. 

Sodium ion conduction appears to be common because of the well-known properties of the beta-aluminas and, to a lesser extent, the NASICONs (see Section 2.12.1), Table 2.1. There are, however, relatively few other examples of high Na ion conductivity, especially at room temperature. In contrast to Ag, the usual coordination number of Na is high, often 7-9, and the sites may be distorted. The bonding of Na in such structures is much more ionic than that of Ag, therefore. 

Solid electrolyte Mobile ion Conductivity/S cm temperature/°C Activation energy/e-y Reference 

NASICON Na3Zr2PSi20i2 Na- 1 X 10-300 temperature- dependent Goodenough, Hong and Kafalas, 1976 Kreuer, Kohler and Maier, 1989 

RbAg4l5 Ag 0.25, 25 0.07 O Keeffe and Hyde, 1976 Bradley and Greene, 1966 Owens and Argue, 1967 

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