Protonic conduction in heteropoly compounds

Abstract Protonic conductivity of heteropoly compounds (HPC) A 3 PM 12 O 40 · n H 2 O, where A=H, Li, Na, K, Rb, Cs or NH 4 and M=Mo or W, have been studied in dependence on the degree of hydration and temperature. The greatest conductivity is discovered for the salts of large cations Cs + , Rb + , K + and NH + 4 . For sodium salts with the least hydration degrees the electronic conduction predominates. It is assumed that ionic conduction of HPC is connected with dynamic intracrystalline dissociation of water molecules and formation of virtual protons.