The Electrical Conductivity of Sodium Polysulfide Melts

The electrical conductivities of sod ium polysulfide melts, Na2S4 and Na2S~, were measured as a function of temperature between 300 and 360 ~ Due to the viscous nature of the sod ium polysulfide melts, the conductance cells are axisymmetr ic cylindrical cells with a microelectrode, instead of capillary cells. The values of the Arrhenius activation energy derived f rom the experimental conductivity data are about 33 kJ/mol. The macroscopic mode l of sod ium polysulfide melts has described the melts as composed of sod ium cations, monosul f ide anions, and neutral sulfur soIventJ For this model, the binary interaction coefficients quantifying the interaction between sod ium cations and monosul f ide anions were calculated f rom the exper imental conductivity data and literature data for the transference number, diffusion coefficient, activity coefficient, and density