Electrical Properties of Vanadium-doped Lanthanium Silicates for SOFCs

In this paper to improve the ionic conduction properties, lanthanum silicate apatite ceramic, which substituted by V ions at Si-site, were fabricated by the mixed-oxide method. And we investigated the structural and electrical properties of specimens with variation of dopants for the application of solid oxide fuel cells. The sintering temperature of specimens decreased from to . As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution in a apatite polycrystallin structure. But the specimens doped with more than 1.5mol% showed the second phase, and . The specimen dopants with 1.0 mol% showed the maximum ion conductivity. Ion conducting and activation energy of the specimens were about 1.62 eV at , respectively.