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

摘要

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.