The Solid Electrolyte System RbCu4Cl3 ( I 2 − x Cl x ) , 0 ≤ x ≤ 0.40: I . Stability

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Abstract
The stoichiometric solid electrolyte, , can be converted, by cold‐work, to a new low symmetry phase with the probable composition (and very small amounts of and probably,). The new phase has a crystal structure which appears to be related to that of the cubic phase. It transforms rapidly to the cubic phase with formula at temperatures above 75°C. The new phase is stable in a very narrow temperature range, almost surely not wider than 0°–35°C. It has a conductivity of at 298 K. Stoichiometric is thermodynamically stable in the narrow temperature range . The solid solution range has been confirmed. For , the materials appear to be stable from at least 78 K to their preparation temperatures which depend on . None of these can be made to convert to the new phase; that is to say, the only established route to the new phase is through cold‐working of the stoichiometric phase.

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