Crystal data for two series of solid solutions: (Rb_xK_1-x) Ag₄I₅ and (RB_xK_1-x)₂AgI₃

Cell data for cubic solid electrolytes RbAg₄I₅ (i) and KAg₄I₅ (ii) are accurately given: (i) a = 11.235±0.006 Å, (ii) a = 11.143±0.006 Å. Precise crystal data are also shown for orthorhombic Rb₂AgI₃ (a = 19.957 + 0.006, b = 10.227±0.003, c = 4.896±0.003 Å) and K₂AgI₃ (a = 19.522±0.009, b = 10.011± 0.003, c = 4.775±0.003 Å). Crystallographic behaviour with respect to the value of x for (Rb_xK_1-x)Ag₄I₅ and (Rb_xK_1-x)₂AgI₃ solid solutions is described.