Synthesis of nano-crystalline apatite type electrolyte powders for solid oxide fuel cells

Rare earth silicates with apatite structure are being actively studied as an alternative electrolyte material for solid oxide fuel cells (SOFC) operating in the intermediate temperature range. In this paper we report on the synthesis of La 9.33+ x/3 Al x Si 6− x O 26+ δ (with x = 0–1.5) and La 9.83F...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010-05, Vol.30 (7), p.1699-1706
Main Authors: Jothinathan, E., Vanmeensel, K., Vleugels, J., Van der Biest, O.
Format: Article
Language:English
Subjects:
Apatite
Apatite type lanthanum silicates
Ceramics
Density
Dwellings
Electrolytes
Modified sol–gel
Nanocrystals
Nanopowder
Pressureless sintering
Sintering temperature
Solid oxide fuel cell
Synthesis
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Summary:Rare earth silicates with apatite structure are being actively studied as an alternative electrolyte material for solid oxide fuel cells (SOFC) operating in the intermediate temperature range. In this paper we report on the synthesis of La 9.33+ x/3 Al x Si 6− x O 26+ δ (with x = 0–1.5) and La 9.83Fe 1.5Si 4.5O 26 powders using a modified sol–gel process. The parameters involved in the process have been optimized for preparing phase pure, homogeneous and nanometer sized powders. The obtained powders were characterized using scanning electron microscopy, X-ray diffraction and thermal analysis. Pressureless sintering experiments were performed and pellets having relative densities greater than 96% could be obtained after 5 h dwelling in the temperature range between 1500 and 1550 °C.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.01.003