Ceria Diffusion and Electrical Properties on Lanthanum doped Strontium Titanate

摘要

The Ce component was coated on the as-prepared La_(0.3)Sr_(0.7)TiO_3 (LST) particles. The lattice of LST did not change with the amount of Ce-coating after 1300-1400℃ sintering in air but distortion occurred for the Ce-LST sintered at the temperature of 1500℃. The Ce diffusion into LST lattice to affect the lattice distortion was also observed for sintering at 1400℃ in activated carbon atmosphere. The 1.5 and 3.0 mol% Ce coatings exhibited slightly lower conductivities than LST without Ce-coating under the 95%Ar+5%H_2 atmosphere. The conductivity decreased significantly when the Ce-coating was too high such as 6 mol%. The Ce-LST anode increased the power performance of half-cell compared with the LST anode without Ce-coating. A suitable Ce-coating could behave high power density of the half-cell 3.0 mol% Ce-LST/LSBC. Thus, the Ce coating on LST could enhance the electrical properties of LST/LSBC cell due to the effect of Ce species diffusion into LST structure.