Electrical Properties of Yttrium-Doped Strontium Titanate under Reducing Conditions

The electrical conductivity of SrTiO3 containing rare earth dopants (Y, La, Pr, Sm, Nd, Gd, or Yb) was measured at 600-900°C in reducing atmospheres. An unusually high conductivity was observed for the yttrium-doped samples compared to those with rare earth dopants, particularly at the composition of the solubility limit Sr0.88Y0.08TiO3−δ where the conductivity at 800°C was 64 S/cm. The conductivity was confirmed to be n-type by thermopower …