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RESEARCH PRODUCT
Novel chemical reaction co-precipitation method for the synthesis of apatite-type lanthanum silicate as an electrolyte in SOFC
Nouredine FeninecheMichel MoliereYangzhou MaYangzhou MaZexin YuOmar Elkedimsubject
Materials scienceInorganic chemistrychemistry.chemical_element02 engineering and technologyConductivity010402 general chemistry01 natural sciencesChemical reactionApatitelaw.inventionlawImpurityPhase (matter)Materials ChemistryLanthanumIonic conductivityCalcinationMechanical EngineeringMetals and Alloys021001 nanoscience & nanotechnology0104 chemical scienceschemistryMechanics of Materialsvisual_artvisual_art.visual_art_medium0210 nano-technologydescription
Abstract Apatite-type lanthanum silicates have promising performance as electrolyte materials for IT-SOFC. A novel co-precipitation method, based on chemical reaction, is employed in the synthesis process. The reaction products: La(OH) 3 and SiO 2 are used as precursors of apatite synthesis process. The precursors are mixed in molecular scale which provide much conducive to formation reaction. The pure apatite phase composition is obtained with quite moderate temperature of 700 °C for 6 h which shows considerable ionic conductivity performance. The conductivity decreases when you increase the calcination temperature in according with XRD measurement. The XRD measurement shows the presence of impurity phase when the calcination temperature increases. Furthermore, the activation energies of the apatite synthesized in this study are rather high in comparison with the literature data, which can be attributed to a presence of the impurity phase. The ionic conductivity is controlled by the grain boundaries contributions for low calcination temperature and by the grains contributions for the sample calcined at 1000 °C.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-11-01 | Journal of Alloys and Compounds |