Thermoelectric Properties of Reduced Polycrystalline Sr0.5Ba0.5Nb2O6 Fabricated Via Solution Combustion Synthesis

摘要: The thermoelectric properties of bulk polycrystalline Sr0.5Ba0.5Nb2O6 (SBN50) fabricated via solution combustion synthesis (SCS) and reduced at temperatures 900°C–1150°C were explored. Seebeck coefficient (S) all samples increased over the entire range testing temperatures; a peak S value −281 μV/K was obtained 930 K for sample 900°C. A metal-insulator transition observed in electrical conductivity (σ) 1000°C–1150°C, whereas only semiconducting behavior An optimal balance between σ achieved pellet 1000°C, which exhibited maximum power factor 1.78 μW/cm·K2 930 K. Over temperature 300–930 K, thermal (κ) as-processed (1000°C) SBN50 found to be 1.03–1.4 1.46–1.84 W/m·K, respectively. figure merit (ZT) 0.09 1000°C-reduced sample. X-ray photoelectron spectroscopy revealed that Nb2+ intensity higher reduction temperatures, could possibly lead distortion NbO6 octahedra decrease coefficient.