Electrical transport in copper and cobalt ferricyanides

Copper and cobalt ferricyanides are found to be electrical conductors. The temperature variation of their resistivities are studied. It is found that the activation energy of copper ferricyanide is 0.23 eV provided the sample is not heated above 118°C. If the sample is heated above 118°C a partial chemical degradation of the compound transforms the activation energy to 1.43 eV. Cobalt ferricyanide has exactly similar behaviour, the activation energy changes from 0.25 eV to 0.61eV if the sample is heated above 132°C.