Magnesium doped lanthanum silicate with apatite-type structure as an electrolyte for intermediate temperature solid oxide fuel cells

Preparation of transparent oxyapatite ceramics by combined use of freeze-drying and spark-plasma sintering

“…All peaks can be indexed in an hexagonal apatite phase as shown by comparison with the simulated diagram taken from previously published structural data. 11,12 Images of the obtained ceramics after polishing are shown in Fig. 3.…”

Neutron diffraction and atomistic simulation studies of Mg doped apatite-type oxide ion conductors

“…In terms of doping studies, a wide range of dopants have been reported [17,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], Rare earth site: Mg, Ca, Sr, Ba, Bi, Mn, Co, Ni, Cu Si site: Ge, Ti, P, B, Al, Ga, Mn, Co, Fe, Mg, Zn, Ni, Cu Initial studies showed that doping with lower valent ions, e.g. B 3+ , Al 3+ , Ga 3+ , on the Si site, while maintaining oxygen stoichiometry, i.e.…”

Fabrication and electrical properties of La8.33Sb(SiO4)6O2 thick films for solid oxide fuel cells

“…3,4 In addition, it has been reported that these lanthanum silicatebased apatite materials have high oxygen ion transference numbers (>0.9) over a wide range of oxygen partial pressures. [5][6][7] For these reasons, rare earth-or alkaline earthcontaining apatite-type oxides are substances with high potential as alternative materials to high temperature SOFCs. Lanthanide silicate-based compositions [Ln 10Àx Si 6 O 26 (Ln ¼ La, Sm, Nd, Dy, Gd, x ¼ 8 to 11)] with apatite structure have recently been attracting a lot of attention due to high ionic conductivity at relatively low temperatures (about 600 C) and exhibiting conductivities higher than the conventional stabilized zirconia electrolyte.…”

“…[5][6][7] For these reasons, rare earth-or alkaline earthcontaining apatite-type oxides are substances with high potential as alternative materials to high temperature SOFCs. Lanthanide silicate-based compositions [Ln 10Àx Si 6 O 26 (Ln ¼ La, Sm, Nd, Dy, Gd, x ¼ 8 to 11)] with apatite structure have recently been attracting a lot of attention due to high ionic conductivity at relatively low temperatures (about 600 C) and exhibiting conductivities higher than the conventional stabilized zirconia electrolyte. 8 The oxygen transport in Ln 10Àx (SiO 4 ) 6 O 26y (Ln ¼ La-Yb, x ¼ 0-0.67) materials increases with the increased Ln 3þ radius, whereas its activation energy decreases and ion conductivity increases.…”

“…Lanthanide silicate-based compositions [Ln 10Àx Si 6 O 26 (Ln ¼ La, Sm, Nd, Dy, Gd, x ¼ 8 to 11)] with apatite structure have recently been attracting a lot of attention due to high ionic conductivity at relatively low temperatures (about 600 C) and exhibiting conductivities higher than the conventional stabilized zirconia electrolyte. 8 The oxygen transport in Ln 10Àx (SiO 4 ) 6 O 26y (Ln ¼ La-Yb, x ¼ 0-0.67) materials increases with the increased Ln 3þ radius, whereas its activation energy decreases and ion conductivity increases. 9 The apatite lattice can tolerate considerable A-site deficiency and extensive doping, thus providing an important tool for further optimization.…”