Figure 2.

Theoretical predictions for GB-dominated charge transport in SrTiO₃ ceramics using the two-phase model. (a) Modeled temperature dependency of electrical conductivity for SrTiO₃ ceramics with different reference band offset values (ΔE₀) and a fixed t_GB value of 0.0005; other parameters (a, σ_E0,G, and σ_E0,GB) are kept at the universal values shown in Table 1. (b) Simulated log |S| – log σ plots (thick solid lines) and plots of the power factor as a function of log σ (feint lines) at room temperature (300 K) for SrTiO₃ ceramics with different values of ΔE₀. The modeled results for a single crystal (t_GB = 0; solid black line) are added for reference purposes.