The Nature of Charge Carriers and Their Transport Numbers in Glasses of the Ag_2O-B_2O_3 System

摘要

The temperature-concentration dependence of the dc electrical conductivity of glasses in the xAg_2O-(1 - x)B_2O_3 (0.05 < x < 0.25) system is investigated using active (amalgam) electrodes.A series of glasses are synthesized with the use of D_2O as an isotope tracer.The analysis of data on the electrolysis of glasses at 0.15 < x < 0.225 demonstrates that charge carriers in these glasses involve protons formed upon dissociation of impurity water.The water content is evaluated by IR spectroscopy.The electronic component of the total electrical conductivity is determined by the Liang-Wagner technique.It is shown that the contribution of the electronic component does not exceed the sensitivity of the technique (10~(-2)-10~(-3)%).The participation of silver ions in electricity transport processes is studied by the Hittorf method.It is demonstrated that their transport numbers do not exceed 0.53.A comparison of the physicochemical properties of glasses in the Ag_2O-B_2O_3 and Na_2O-B_2O_3 systems shows that sodium and silver ions occupy different positions in the structure.