Electrical Conductivity of Tungsten-Containing Ammonia Solutions and Calculation of Its Activation Energy

Abstract

Abstract—The activation energy of the electrical conductivity of ammonium hydroxide–tungstate ion solutions is determined in the NH4OH concentration ranges 0.01–6 and 0.01–0.2 mol/L (based on the metal). For all solutions, the activation energy decreases substantially with increasing temperature and decreases insignificantly with increasing tungsten content in a solution at a constant ammonium hydroxide concentration. An increase in the NH4OH concentration at a constant tungsten content in a solution is found to cause an increase in the activation energy. All calculated activation energies suggest that the charge transfer in the system under study is determined by diffusional restraints.