This intermediate compound in the CuCl-RbCl system was prepared in monocrystalline form. It was found that it exhibited a Cu-ion conductivity of 1.89 x 10-6S/cm at 25C, and an activation energy of 45.0kJ/mol.

R.Kanno, Y.Takeda, Y.Masuyama, O.Yamamoto, T.Takahashi: Solid State Ionics, 1983, 11[3], 221-6