Synthesis and thermoelectric properties of Y doped SrTiO₃ by modified pechini's method

Thermoelectric properties of Sr_1-xY_xTiO₃ (x = 0-0.08) were calculated using a virtual crystal method. Using a Pechini's method, Sr_1-xY_xTiO₃ (x = 0-0.06) precursor powder was prepared. Using this method, we prepared pure SrTiO₃ at a lower temperature than would be using the conventional solid-state reaction method. The precursor solution was heated at 823 K for 5 h after drying at 353 K for 8 h to produce the precursor powder. The powder was sintered using a hot pressing technique. The relative densities of ceramics were more than 98%. The Seebeck coefficient and electrical conductivity of the samples were measured using the standard four-probe method in a flowing He gas atmosphere in a temperature range of 323 to 923 K. The conductivities of SrTiO₃, Sr_0.97Y_0.03TiO₃, and Sr_0.94Y _0.06TiO₃ at room temperature were 6.61 × 10 ², 5.61 × 10³, and 1.58 × 10⁴ S/m, respectively. The Seebeck coefficients of SrTiO₃, Sr _0.97Y_0.03TiO₃, and Sr_0.94Y _0.06TiO₃ at room temperature were -548, -264, and -196 μV/K, respectively.