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S??ntese de silicato de lant??nio tipo apatita pelo m??todo sol-gel utilizando silicato de s??dio como fonte de s??lica
Synthesis of lanthanum silicate apatite-type by sol-gel method using sodium silicate as source of silica
Autor
SILVA, F.S.
RODRIGUES, V.G.
MISSO, A.M.
MORAIS, V.R.
YAMAGATA, C.
CONGRESSO BRASILEIRO DE CERAMICA, 60.
Resumen
Ceramics of lanthanum silicate apatite-type have been studied with great technological interest at IT-SOFC applications (Intermediate Temperature Solid Oxide Fuel Cell) for having good ionic conductivity at intermediate temperatures (600-800??C), higher than that of YSZ (Ytria Stabilized Zirconia) in high-temperature SOFCs. At this work has made the synthesis of the lanthanum silicate apatite-type from Na2SiO3 as a source of silica by the modified sol-gel method that allowed the formation of ceramic powders of lanthanum silicate apatite-type in calcination temperature at 900??C, which is much lower than those other methods of synthesis. Analysis by x-ray diffraction (XRD) showed the lanthanum silicate apatite-type phase as the main phase. Scanning electron microscopy was used to nanometric powders observation.