Synthesis and Conductivity Investigation of Cu Doped Apatite Type Lanthanum Silicate Electrolyte

摘要

In this paper, Cu-doped lanthanum silicate electrolyte (La_(9.33)Si_(6-x)Cu_xO_(26-x)) precursor was synthesized by urea-nitrate combustion method using La_2O_3, CuO and TEOS as raw materials. The as-prepared precursor was lighted at 600°C and sintered at 800°C. The sintered powder samples were grinded and mixed absolutely by ball milled. Finally, we preformed and sintered powder samples to synthesis Cu-doped lanthanum silicate ceramics. Ac impedance method and analysis was used to test conductivity of as-prepared electrolyte, investigated the influence of balling time, sintering temperature and doping content on conductivity property of LSO sintered product. The final result shows that best balling time is 3h, secondary sintering temperature is 1500°C and the doping content is 0.3. Under this condition, the conductivity of Cu-doped lanthanum silicate electrolyte could reach 7.28×10~(-3)s/cm at 700°C.