Abstract
Lanthanum silicate oxyapatite ((LSO, La9.33+2x(SiO4)6O2+3x)(0<x<0.33)) is an oxygen-ion conductor that offers some advantages over the typical yttria-stabilized zirconia (YSZ) used in SOFCs. LSO has higher oxygen-ion conductivity than YSZ at temperatures below 873K.The powder was synthesized from reagent grade La2O3 and SiO2 powders. Presents an average primary particle size of 0.9µm and the final powder presents an intermediate phase between La9,33Si6O26 and La10(SiO4)6O3 with a minimum percentage (<1%) of La2O7Si2.Colloidal processing optimization was done, obtaining 1.5wt% of polyethyleneimine (PEI), which is used as dispersant in ethanol-based suspensions.Electrophoretic deposition (EPD) process was studied analyzing the pH and voltage effect. The conditions for obtaining thick films were studied. Conventional sintering between 1300 and 1600°C was also analyzed. A highly dense material with 99.1% of the theoretical density and a Vickers hardness of 7.57GPa was obtained.
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