Synthesis and Characterization of MgO- doped SrTiO3 Ceramics

The micro structural, dielectric and electrical properties have been studied for magnesium doped strontium titanate ceramics synthesized via conventional solid state reaction method which were calcined at 1150 C-0 for 9hr and sintered at 1300 C-0 for 3hrs respectively. The high dielectric constant (epsilon(r)) and low loss tangent (tand) were noticed at RT (room temperature) as 88.1 (0.1 kHz), 45.4 (5 MHz) and 0.0067 (0.1 kHz) respectively for dielectric applications. The strong relaxation dynamics in loss factor was observed at higher temperatures for lower frequencies particularly. AC and DC-conductivity variations with temperatures were performed and the activation energies (E-a) were calculated using the lns Vs 1/T plots. Apart from the samples were characterized using XRD, FESEM, and EDAX for structural, surface morphological, elemental analysis respectively. (MgO)(0.1) doped (SrTiO3)(0.9) showed seebeck coefficient of 467.4 mu V/K as the slope of curve for the thermoelectric applications.