High-temperature carrier transport and thermoelectric properties of (Sr1-xEux)TiO3 alloy

Abstract

Carrier transport and thermoelectric properties of (Sr_1-xEu_x)TiO₃ (x = 0.05 ~ 1.0) dense ceramics were measured at high temperatures (300 ~ 1000K) to clarify the role of Eu²⁺ ion in SrTiO₃ lattice. Although the unintentionally doped SrTiO₃ (reduced) exhibited degenerated conduction behavior, carrier concentration of the Eu-substituted samples increased with temperature (Ea ~ 1 eV), which indicates that Eu ion plays a carrier generator. Figure of merit ZT of the (Sr_1-xEu_x)TiO₃ ceramics was, drastically increased with temperature and reached ZT ~ 0.15at 1000 K.