Highly dense Sr 0.95 Sm 0.0125 Dy 0.0125 □ 0.025 Ti 0.90 Nb 0.10 O 3±δ /ZrO 2 composite preparation directly through spark plasma sintering and its thermoelectric properties

The Sr_0.95Sm_0.0125Dy_0.0125□_0.025Ti_0.90Nb_0.10O_3±δ/ZrO₂ composite was directly prepared through spark plasma sintering. This approach limited the grain growth and facilitated the achievement of a narrow grain size distribution due to fast sintering and ZrO₂ effects. Thermal conductivity declined to 1.68 W m^-1 K^-1, which is the lowest among the reported values for micro-polycrystalline SrTiO₃-based structures.