Low temperature synthesis of lanthanum silicate apatite type by modified solgel process
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2014
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Advanced Materials Research
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Rare earth silicate apatite type is a very important and promising material for application
as an electrolyte in IT-SOFC (Intermediate Temperature Solid Oxide Fuel Cell). Lanthanum silicate
apatite, La9.33Si6O26, exhibits high conductivity and has high efficiency, long term stability, fuel
flexibility, low emissions and relatively low cost compared to yttria stabilized zirconia (YSZ), at
temperatures between 600 and 800 °C. One of the problems of YSZ is its high operating
temperature, which results in long starting times and problems of mechanical and chemical
compatibility. The interest of investigating lanthanum silicate apatite as an electrolyte is to
overcome the problems caused by high temperature operation required by YSZ electrolyte. In the
present study, the sol-gel method was used to synthesize La9.33Si6O26. Initially, the reagents (sodium
silicate and lanthanum nitrate) were mixed to obtain colloidal silica. Then, this gel containing
lanthanum nitrate was thermally treated to allow the melting of lanthanum nitrate salt distributed on
colloidal silica. The aim of this study was to verify if this method permits the formation of
La9.33Si6O26 pure apatite phase, in order to obtain fine powders and uniform particles for further
processing and obtaining a ceramic body.
Como referenciar
MISSO, AGATHA M.; ELIAS, DANIEL R.; SANTOS, FERNANDO dos; YAMAGATA, CHIEKO. Low temperature synthesis of lanthanum silicate apatite type by modified solgel process. Advanced Materials Research, v. 975, p. 143-148, 2014. DOI: https://doi.org/10.4028/www.scientific.net/AMR.975.143. Disponível em: http://repositorio.ipen.br/handle/123456789/23686. Acesso em: 16 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.