4:00 PM - 6:00 PM
▲ [19p-PA8-5] The effect of rare earth ions on the tin oxide based materials for thermoelectric applications
Keywords:Perovskite, Thermoelectric, Seebeck coefficient
Abstract:
Thermoelectric is one of the emerging technologies to effectively generate the electricity from waste heat which is coming out from industries, thermal power plants and automobiles. The performance of a thermoelectric material is based on the electrical and thermal conductivity of the material. Bismuth telluride is one of the well known thermoelectric materials for low temperature applications. However the Bismuth based materials are easily oxidized when exposed to air atmosphere. On the other hand, oxide materials are highly useful for high temperature thermoelectric applications. Metal oxide based perovskites have attracted high attentions as a novel thermoelectric material due to their excellent tunable electrical conductivity. In the present work, Ba1-xLaxSnO3 and Ba1-xSrxSnO3 materials were prepared with x=0,0.02,0.06,0.1 by polymerization complex (PC) method and pellets of the prepared materials were made using high pressure and high temperature sintering (HPHTS) method. The synthesized materials were characterized by XRD, SEM and TEM analysis for studying their structural and morphological properties. XRD analysis revealed the mixed phases of tin oxide and Ba1-xSrxSnO3 perovskite structure. The SEM images of Ba1-xLaxSnO3 shows spherical like morphology whereas Ba1-xSrxSnO3 and BaSnO3 shows rod like morphology with diameter of 10 to 15 nm. The Seebeck coefficient (S) of the samples was measured as a function of temperature. The Seebeck coefficient (Fig 1) of Ba1-xLaxSnO3 is relatively higher than that of BaSnO3 and Ba1-xSrxSnO3 especially at high temperatures.
Thermoelectric is one of the emerging technologies to effectively generate the electricity from waste heat which is coming out from industries, thermal power plants and automobiles. The performance of a thermoelectric material is based on the electrical and thermal conductivity of the material. Bismuth telluride is one of the well known thermoelectric materials for low temperature applications. However the Bismuth based materials are easily oxidized when exposed to air atmosphere. On the other hand, oxide materials are highly useful for high temperature thermoelectric applications. Metal oxide based perovskites have attracted high attentions as a novel thermoelectric material due to their excellent tunable electrical conductivity. In the present work, Ba1-xLaxSnO3 and Ba1-xSrxSnO3 materials were prepared with x=0,0.02,0.06,0.1 by polymerization complex (PC) method and pellets of the prepared materials were made using high pressure and high temperature sintering (HPHTS) method. The synthesized materials were characterized by XRD, SEM and TEM analysis for studying their structural and morphological properties. XRD analysis revealed the mixed phases of tin oxide and Ba1-xSrxSnO3 perovskite structure. The SEM images of Ba1-xLaxSnO3 shows spherical like morphology whereas Ba1-xSrxSnO3 and BaSnO3 shows rod like morphology with diameter of 10 to 15 nm. The Seebeck coefficient (S) of the samples was measured as a function of temperature. The Seebeck coefficient (Fig 1) of Ba1-xLaxSnO3 is relatively higher than that of BaSnO3 and Ba1-xSrxSnO3 especially at high temperatures.