Abstract
The thermodynamic properties of solid solutions with hexagonal structure have been measured using a solid‐state cell, incorporating a composite solid electrolyte with step‐changes in composition. The cell with the onfigurationX=1 X=X was investigated in the temperature range of 925 to 1165 K. The composite gradient solid electrolyte consisted of pure at one extremity and the solid solution under study at the other. The Nernstian response of the cell to changes in partial pressures of and at the electrodes and temperature was demonstrated. The activity of in the solid solution was measured by three techniques. All three methods gave identical results, indicating unit transport number for K+ ions and negligible diffusion potential due to concentration gradients of carbonate and sulfate ions. The activity of exhibits positive deviation from Raoult's law. The excess Gibbs energy of mixing of the solid solution can be represented using a subregular solution modelBy combining this information with the phase diagram, mixing properties of the liquid phase were obtained.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call