Synthesis and electrical conductivity of La0.6Sr0.4Ru0.9Mg0.1O3-.DELTA. perovskite solid solution

La0.6Sr0.4Ru0.9Mg0.1O3-δ (LSRM) powder was prepared by co-precipitation method using ammonium carbonate solution and nitrate solutions. The freeze-dried suspension was decomposed at 1000°C in air. The obtained LSRM powder was sintered in air at 1200°C for 4 h to measure the electrical conductivity. The LSRM solid solution, which was stable in the temperature range from 1000 to 1500°C in air, was referred to an orthorhombic structure. The measured true density of LSRM powder was close to the density calculated using X-ray diffraction data. No chemical reaction occurred between LSRM and Gd-doped ceria electrolyte at 1000°C in air. The electronic conductivity of LSRM measured by a four-terminal DC method was 423 and 361 S·cm-1 at 300 and 800°C, respectively.