Facile preparation of apatite-type lanthanum silicate by a new water-based sol-gel process
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2013
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Materials Research Bulletin
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In recent years, apatite-type lanthanum silicates ([Ln10x(XO4)6O3–1.5x] (X = Si or Ge)) have been studied
for use in SOFC (solid oxide fuel cells), at low temperature (600–800 8C), due to its ionic conductivity
which is higher than that of YSZ (Yttrium Stabilized Zirconia) electrolyte. For this reason they are very
promising materials as solid electrolyte for SOFCs. Synthesis of functional nanoparticles is a challenge in
the nanotechnology. In this work, apatite-type lanthanum silicate nanoparticles were synthesized by a
water-based sol–gel process, i.e., sol–gel technique followed by chemical precipitation of lanthanum
hydroxide on the gel of the silica. Na2SiO3 waste solution was used as silica source. Spherical aerogel
silica was prepared by acid catalyzed reaction, followed by precipitation of lanthanum hydroxide to
obtain the precursor of apatite-type lanthanum silicate. Powders of apatite-type lanthanum silicate
achieved from the precursor were characterized by thermal analysis, X-ray diffraction (XRD), scanning
electron microscopy (SEM) and specific surface area measurements (BET). The apatite phase was formed
at 900 8C.
Como referenciar
YAMAGATA, CHIEKO; ELIAS, DANIEL R.; PAIVA, MAYARA R.S.; MISSO, AGATHA M.; CASTANHO, SONIA R.H.M. Facile preparation of apatite-type lanthanum silicate by a new water-based sol-gel process. Materials Research Bulletin, v. 48, n. 6, p. 2227-2231, 2013. DOI: 10.1016/j.materresbull.2013.02.041. Disponível em: http://repositorio.ipen.br/handle/123456789/4076. Acesso em: 16 Mar 2025.
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