In this paper to improve the ionic conduction properties, lanthanum silicate apatite La9.33(SiO4)6O2 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 La9.33(Si6-□v□)6O26 specimens with variation of dopants for the application of solid oxide fuel cells. The sintering temperature of La9.33(Si6-□v□)O26 specimens decreased from 1,600℃ to 1,400℃. As results of X-ray diffraction patterns, all La9.33(Si6-□-□)O26 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, La2 SiO5 and SiO2. The specimen dopants with 1.0 mol% showed the maximum ion conductivity. Ion conducting and activation energy of the La9.33(Si5V1)O26 specimens were about 7.8×10-4 S/cm 1.62 eV at 600℃, respectively.
