Synthesis and characterization of La0.85Sr0.15Ga0.80Mg0.20O2.825 by glycine combustion method and EDTA combustion method

The powders of La0.85Sr0.15Ga0.80Mg0.20O2.825(LSGM) were synthesized by glycine combustion method (GCM) and EDTA combustion method (EDTACM). XRD results show that the main phase (LSGM) exists in the uncalcined powders synthesized by GCM. The LSGM materials are composed of the main phase without secondary phases when calcined at 1300 °C. The LSGM materials contain fewer amounts of secondary phases than those prepared by EDTACM at the same calcination temperature. The conductivities of LSGM increase with the increase of testing temperature. The ionic conductivities of LSGM prepared by GCM and EDTACM were calculated to be 0.053 S cm−1 and 0.060 S cm−1 at 800 °C, respectively. The curve of ln(σT) vs. 1/T exists two straight lines. It indicates that activation energy of oxygen-vacancy motion at lower temperatures is greater than that at higher temperatures.