High-Conductivity Solid Electrolytes: MAg4I5

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Science  21 Jul 1967:
Vol. 157, Issue 3786, pp. 308-310
DOI: 10.1126/science.157.3786.308


The solid electrolytes MAg4I5, where M may be potassium, rubidium, or ammonium, have an ionic conductivity of 0.2 (ohm cm)-1 at 20°C. Although pure CsAg4I5 does not form, partial substitution of cesium into the M position was obtained. The high-conducting phases of KAg4I5 and RbAg4I5 may be quenched to low temperatures, where they transform to resistive phases at -136° and -155°C, respectively.