Rubidium silver iodide
Rubidium silver iodide is a ternary inorganic compound with the formula RbAg4I5. It is an unusual solid where the conductivity involves movement of silver ions within the crystal lattice. It was discovered while searching for chemicals which had the ionic conductivity properties of alpha-phase silver iodide at temperatures below the 146 °C for AgI.
Rubidium silver iodide can be formed by melting together or grinding together stoichiometric quantities of rubidium iodide and silver(I) iodide. The reported conductivity is 25 siemens per metre (that is a 1×1×10 mm bar would have a resistance of 400 ohms along the long axis).
The crystal structure is composed of sets of iodine tetrahedra; they share faces through which the silver ions are able to diffuse.
Rubidium silver iodide family is a group of compounds and solid solutions which are isostructural with the RbAg4I5 alpha modification. The examples of such advanced superionic conductors with mobile Ag+ and Cu+ cations are: KAg4I5, NH4Ag4I5, K1−xCsxAg4I5, Rb1−xCsxAg4I5, CsAg4Br1−xI2+x, CsAg4ClBr2I2, CsAg4Cl3I2, RbCu4Cl3I2, KCu4I5 and others.
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