Synthesis and characterization of calcium and iron co-doped lanthanum silicate oxyapatites by sol–gel process for solid oxide fuel cells

Synthesis and characterization of Al3+ and M (M = W6+, In3+, Nb5+, Mg2+) co-doped lanthanum silicate oxy-apatite electrolytes

“…Fig. 2 shows the typical impedance spectra measured at different temperatures for La 10 Si 5 Al 0.9 W 0.1 O 26.65 sample sintered at 1873 K for 6 h. Based on the equivalent circuit model consisting of a serial association of (R//CPE) elements (R: resistance; CPE: constant phase element) attributed to electrolyte or electrode processes, the high and medium frequency arcs can be identified with the grain bulk (R g ) and grain boundary (R gb ) resistances, respectively [32,41]. The electrical conduction of the co-doped apatite lanthanum silicates is controlled by the grain and grain boundary contributions together.…”

“…Recently, some research also has been reported on the oxyapatite lanthanum silicates with the cations co-doping on both La 3þ and Si 4þ site, such as Ba and Al co-doping [39], Sr and Al or Fe co-doping [40], Ca and Fe co-doping [41]. However, the research of the co-doping strategy on Si 4þ site is limited.…”

Low-temperature synthesis of apatite-type La 9.33 Ge 6 O 26 as electrolytes with high conductivity

“…Apatite-type lanthanum silicates (ATLS) and apatitetype lanthanum germanates (ATLG), as novel electrolytes for the intermediate temperature solid oxide fuel cells (IT-SOFCs), [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] have been attracting widespread attention of the scientific community due to their clean energy conversions, superior ionic conductivities, excellent long-term stabilities and low processing cost. In contrast to the fact that traditional fluorite and perovskite-type oxide ion conductors have a vacancy conduction mechanism, [16][17][18] apatite-type materials have an especial interstitial oxide ion conduction mechanism, [19,20] which could be responsible for their high oxide-ion conductivities.…”

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

“…To control the reaction and hydrolysis rates, water is added to the molecular precursor in the presence of an acid or basic catalyst [7]. The sol-gel method has been widely applied in the production of various materials ranging from purely inorganic materials to organic and biological systems, that allow the development of biosensors used in medical diagnosis [9,10], superhydrophobic and superficial superphobic studies [11], superconductors [12,13], fuel cells [14,15], ceramic compounds [16], dental ceramics [17] and other materials, in a wide range of compositions. Sol-gel technology has found great potential for applications in the scientific and technological fields because the processes can be developed at room temperature, the combination of properties and the enormous advantages inherent in greater homogeneity and purity, easier control in size and form of the final material, and greater manageability [9,18].…”