The thermoelectric properties of Sr1-xBixTiO_(3-δ)(0≤x≤0.07)have been investigated.Dense ceramics of Sr1-xBixTiO_(3-δ) and Sr0.95TiO_(3-δ) have been prepared by solid-state reaction and conventional sintering in ...The thermoelectric properties of Sr1-xBixTiO_(3-δ)(0≤x≤0.07)have been investigated.Dense ceramics of Sr1-xBixTiO_(3-δ) and Sr0.95TiO_(3-δ) have been prepared by solid-state reaction and conventional sintering in air followed by annealing in a reducing atmosphere.XRD and SEM analyses show that the rutile TiO_(2 i)n Sr_(0.95)TiO_(3) formed after sintering becomes Magneli phase of TinO_(2n-1) after annealing.Moreover,Bi resolves from Sr1-xBixTiO_(3 )after annealing,resulting in the formation of Sr1-xBixTiO_(3-δ)/Bi/TinO_(2n-1) composites.With increasing Bi content in Sr1-xBixTiO_(3-δ),the electrical conductivity increases while the absolute values of the Seebeck coefficient decrease as a result of increasing carrier concentration.The thermal conductivity of SrTiO_(3-δ) is reduced by doping Bi up to x=0.07.Highest ZT~0.13 is obtained in Sr0.93Bi0.07TiO_(3-δ) at 1000 K.展开更多
文摘The thermoelectric properties of Sr1-xBixTiO_(3-δ)(0≤x≤0.07)have been investigated.Dense ceramics of Sr1-xBixTiO_(3-δ) and Sr0.95TiO_(3-δ) have been prepared by solid-state reaction and conventional sintering in air followed by annealing in a reducing atmosphere.XRD and SEM analyses show that the rutile TiO_(2 i)n Sr_(0.95)TiO_(3) formed after sintering becomes Magneli phase of TinO_(2n-1) after annealing.Moreover,Bi resolves from Sr1-xBixTiO_(3 )after annealing,resulting in the formation of Sr1-xBixTiO_(3-δ)/Bi/TinO_(2n-1) composites.With increasing Bi content in Sr1-xBixTiO_(3-δ),the electrical conductivity increases while the absolute values of the Seebeck coefficient decrease as a result of increasing carrier concentration.The thermal conductivity of SrTiO_(3-δ) is reduced by doping Bi up to x=0.07.Highest ZT~0.13 is obtained in Sr0.93Bi0.07TiO_(3-δ) at 1000 K.
