The system was studied at temperatures of between 295K and the melting point. The high-temperature phase was isostructural with α-Ag4RbI5. With decreasing temperature, this transformed to a cubic phase which was believed to have the P213 space group. It was deduced that a triple-point was located at a composition of Cu4(Cs0.64Rb0.36)Cl3(I2-xClx) and a temperature of 399K. The conductivities of the β-phases were relatively low, while the activation enthalpies were relatively high. The conductivity of the β-phase decreased with increasing Rb content. It was suggested that the β-phase belonged to the R3 space group. The conductivities of the high-temperature phases were of the order of 0.7S/cm at 419K, and the activation enthalpies for Cu ion motion were equal to about 0.1eV (table 258).
S.Geller, A.K.Ray, K.Nag: Journal of Solid State Chemistry, 1983, 48[2], 176-88
Table 258
Ionic Conduction Parameters for Cu4CsCl3(I2-xClx)
x | Temperature (K) | σ (S/cm) | Q (eV) |
0.1 | 298 | 0.30 | 0.104 (413-480K) |
0.1 | 419 | 0.69 | 0.104 (413-480K) |
0.167 | 298 | 0.30 | 0.103 (413-485K) |
0.167 | 419 | 0.69 | 0.103 (413-480K) |
0.25 | 298 | 0.29 | 0.101 (413-458K) |
0.25 | 419 | 0.64 | 0.101 (413-458K) |