Abstract
with space group is reported to go through two phase transformations, first to the orthorhombic paraelectric phase and finally to cubic perovskite structure with space group . A discontinuity in volume and enthalpy shown by thermal analysis revealed that both transitions were first order. Electrical conductivity measurements demonstrated that the material remains semiconducting also in the high-temperature cubic state. The conductivity and the temperature of the two phase transitions were shown to be strongly influenced by the partial pressure of oxygen and a -type semiconductivity was suggested. Finally, oxygen hyperstoichiometry of was demonstrated.
- Received 3 March 2009
DOI:https://doi.org/10.1103/PhysRevB.79.214113
©2009 American Physical Society