Apatite-lanthanum silicate had attracted considerable interest in recent years due to its high oxide ion conductivity. Here, V-doped samples La10−xVx(SiO4)6O3+x (0 ≤ x ≤ 1.5) were prepared using the sol-gel method and the influences of V-dopant content upon calcining temperature and conductivity were reported. The samples were characterized using thermal analysis, X-ray diffraction and scanning electron micrography. The apatite was obtained at 800C, a relatively low temperature in comparison to 1500C with the conventional solid-state method. The ceramic pellets sintered at 1200C for 5 h showed a higher relative density than La9.33Si6O26 pellets sintered at 1400C for 20h. The conductivities of samples were measured by electrochemical impedance spectroscopy. The conductivity was improved with the increase of V-dopant content on La site.

Synthesis and Conductivity of Oxyapatite Ionic Conductor La10−xVx(SiO4)6O3+x. W.Yuan, R.Shen, L.Li: Chinese Journal of Chemical Engineering, 2010, 18[2], 328-32