Electric Conductivity of Liquid PbO-SiO₂, PbO-GeO₂, PbO-P₂O₅, PbO-B₂O₃ PbO-SiO₂-GeO₂Systems

Abstract

The electric conductivity of liquid PbO-SiO₂, PbO-GeO₂, PbO-P₂O₅, PbO-B₂O₃ and PbO-SiO₂-GeO₂ systems have been measured at the frequency of 1000c/sec. The conductivity of each system increases as the temperature increases. The Arrhenius type plots show a linear relationship and the activation energies for the binary systems range from 7.7 to 9.8kcal/mol at the composition of 90 mol% PbO. The activation energies for electric conduction increase and the conductivities decrease with increasing acid oxide concentration. The variations of the conductivity by acid oxide concentration is suggested to be due to change of the fraction of anionic species in the melts. Ionic distribution for the system PbO-SiO₂ was calculated by the equations proposed by C. R.. MASSON and the relations with the conductivity have been discussed. On the assumption that Pb²⁺ is the sole carrier of electric conduction, the contribution of the mobility of Pb²⁺ to the conduction is supposed to be larger than that of the number of Pb²⁺ ions.