Synthesis of lanthanum silicate oxyapatite materials as a solid oxide fuel cell electrolyte

International audienceLanthanum silicate oxyapatites of structural formula La9.33+x(SiO4)6O2+1.5x (0 1600 ◦C). X-ray diffraction, scanning electron microscopy and specific surface area measurements were used to analyze the structural and microstructural changes of the as prepared powders heated at different temperatures. Electrical characterization of pure sintered materials was conducted and showed that the incorporation of extra oxide ions, corresponding to the La9.56(SiO4)6O2.34 composition, enhanced the ionic conductivity by one order of magnitude when comparing to that of the La9.33(SiO4)6O2 sampl