ELECTROCHEMISTRY OF SOLID WET AND DRY K3(FE(CN)6)+K4(FE(CN)6)X3H2O (11) MIXTURES - JUNCTION BETWEEN A SOLID WET ELECTROLYTE AND AN ELECTRODE/

Behaviour of a solid electrolyte composed of potassium hexacyanoferrat es (II) and (III) at 25-degrees-C is directly related to its water con tent. At low water content, this solid exhibits an ohmic behaviour and with an increase in the amount of absorbed water a behaviour typical for the ionic conductors is observed. After heating above 70-degrees-C the sample undergoes dehydration and transport of charge through the sample is limited by electronic conductance. At 100-degrees-C and at v ery low water content, a semiconductic behaviour is observed. However, at very high activity of water in the air, the ionic conductance is o bserved again. Resistivity of the sample at 100-degrees-C which shows an ohmic behaviour is directly related to the water content of the sur rounding air. The activation energy (E(a)) in the dehydrated electroly te was determined for three samples with various thickness. The averag e value of E(a) was 33.4 kJ mole-1.