Rubidium silver iodide is a ternary inorganic compound with the formula RbAg4I5.
It was discovered by Dr. Boone Owens while searching for chemicals which had the ionic conductivity properties of alpha-phase silver iodide at temperatures below 146 °C for AgI.
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 diffuse.
[5] Rubidium silver iodide family is a group of compounds and solid solutions that are isostructural with the RbAg4I5 alpha modification.