Defect interactions and the superionic transition temperature: a comparative study

The influence of defect-defect interactions on the superionic transition temperature is studied theoretically. Analytical expressions of superionic transition temperature are obtained for the linear, square root and cube root models of defect-defect interactions. It is shown that the functional form of the concentration dependence describing the defect interactions plays a minor role in the determination of superionic transition temperature when the energy difference between the interstitial sites and lattice sites are much larger than the thermal energy that the ion carries.