1. Schematic diagram of crystal structure for CaTiO₃ at room temperature

2. Schematic diagram of synthesis of CaTiO₃ by hydrothermal method

3. XRD patterns of CaTiO₃ (a, b) powders and (c, d) bulks doped with different elements; (e) SEM image of powder and (f) BES image of bulk for the pristine CaTiO₃ sample

4. SEM images, element mappings, and corresponding EDS spectra of (a) Cr20, (b) Nb20, (c) Eu20, (d) Dy20, (e) Ce20, and (f) La20 powders

5. EPMA images, element mappings, and corresponding chemical compositions of (a) Cr20, (b) Nb20, (c) Eu20, (d) Dy20, (e) Ce20, and (f) La20 bulks

6. Temperature-dependence of (a) electrical conductivity, (b) Seebeck coefficient with inset showing enlarged plots in temperature range of 300-600 K, (d) power factor, (f) total thermal conductivity, (g) lattice thermal conductivity, and (h) ZT of Cr20, Nb20, Eu20, Dy20, Ce20, and La20 bulks, and their (c) carrier concentration at 320 K, (e) Pisarenko curves and (i) ZT compared to literature^{[18⇓⇓-21]}

S1. XRD pattern of the CaTi_0.8Cr_0.2O₃ bulk

S2. Temperature-dependent (a) thermal diffusion, (b) specific heat, (c) electrical thermal conductivity, and (d) Lorenz constant for pristine for Pristine CaTiO₃, Cr20, Nb20, Eu20, Dy20, Ce20, and La20 samples

S3. EPMA backscattering images of the CaTi_0.8Nb_0.2O₃ (Nb20) bulk sintered at (a) 1400, (b) 1450, and (c) 1500 ℃, respectively

S4. Temperature-dependence of the (a) electrical conductivity, (b) Seebeck coefficient, and (c) power factor of CaTi_0.8Nb_0.2O₃ (Nb20) sintered at (a) 1400, (b) 1450, and (c) 1500 ℃, respectively

Table 1. Atomic radii and ionic radii of different atoms

Table 1. Summary of the raw materials used for experiments

Table 2. Nominal chemical compositions, sample codes, measured densities, theoretical densities, and relative densities of the prepared bulk samples