抄録
A series of layered perovskites Ban+1SnnO3n+1 with n=integer was selected as a model oxide to elucidate correlation between the dimensionality of electrical conduction and the thermoelectric power factor. La-doped sintered bodies of Ba2-xLaxSnO4 (n=1), Ba3-xLaxSn2O7 (n=2), and Ba1-xLaxSnO3 (n=∝) were prepared by oxalate coprecipitation method and their electrical conductivity and Seebeck coefficient were measured at high temperatures. For the layered perovskites with n=1 and n=2, single phases of Ba2-xLaxSnO4 and Ba3-xLaxSn2O7 with x=0.0-0.2 were obtained, in which the La atoms were doped into the rock-salt-type Ba site, but the conductivities were in insulating region, suggesting the localization of doped electrons. The doped perovskite Ba0.95La0.05SnO3 with n=∝ showed n-type degenerate semiconducting behavior and the thermoelectric power factors were in the order of 10-7 Wm-1 K-2, which should be increased by the improvement of sinterability.
