Sintering kinetics and oxide ion conduction in Sr-doped apatite-type lanthanum silicates, La9Sr1Si6O26.5

Billen, Claire; Beaudet-Savignat, Sophie; Chartier, Thierry; Maı̂tre, Alexandre; Sauvet, Anne-Laure; Soulestin, Bernard

doi:10.1016/j.ssi.2009.10.009

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…Shaula et al 23 reported a total conductivity value of 3 × 10 −2 S cm −1 at 700 • C for pellets with the same composition (92%TD) using a dry reaction sintering methodology applying a final synthesis-sintering step of 1650 • C/10 h. At temperatures below 800 • C, M-34-U2-10BP tape shows higher conductivity values than YSZ. Similar conductivity values were reported by Bonhomme et al 16 for a thick monolithic electrolyte sample prepared by laminated stacks from oxy-apatite powders (La 9 SrSi 6 O 26.5 ). …”

Section: Resultssupporting

confidence: 88%

“…In this way, oxy-apatite tapes and coatings have been recently prepared by tape casting, [15][16][17] plasma spraying 18 and sputtering. 19 Tape casting is a low-cost well established technique for manufacturing self-supporting ceramic sheets with a wide range of thicknesses (50-500 m) in a continuous way, and has been generally used for the fabrication of microelectronic components.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of aluminium lanthanum oxyapatite tapes, La10AlSi5O26.5, by tape casting and reaction sintering

Santacruz

Porras-Vázquez

Losilla

et al. 2011

Journal of the European Ceramic Society

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Preparation of aluminium lanthanum oxyapatite tapes, La10AlSi5O26.5, by tape casting and reaction sintering

Santacruz

Porras-Vázquez

Losilla

et al. 2011

Journal of the European Ceramic Society

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“…and the treatment at 1400°C led to the excessive precipitation of the lanthanum‐rich secondary phase from the grain surface of samples with x = +0.5. Similar behavior was reported for Sr‐doped apatite‐type lanthanum silicates: below 1450°C a secondary phase exists and above 1500°C a clean boundary was shown by TEM . On the other hand, the surface of the samples with x = 0 and −0.25 is shown to be clean.…”

Section: Resultssupporting

confidence: 81%

Effect of Crystallographic Anisotrophy and Lanthanum Stoichiometry on Microstructural Evolution of Lanthanum Silicate Electrolytes

et al. 2012

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Lanthanum silicates with different lanthanum concentrations La9.33+x(SiO4)6O2+1.5x were prepared by solid state reaction using milling procedures of different degrees and sintered at 1700°C or 1750°C. The phase composition and the microstructural evolution were shown to depend strongly on the heat‐treatment temperature and history. The presence of the liquid phase in the lanthanum‐rich compositions at sintering temperatures is clearly evidenced, which, however, is not in accordance with the known phase relations of the material. Exaggerated growth of plate‐shaped grains in the c‐axis direction was induced by the inhomogeneous presence of the liquid phase. The solid solution region with excess lanthanum appears to extend with increasing temperature, as evidenced by intragranular second phase precipitation on heat treatments at lower temperature as well as the X‐ray powder diffraction results of differently treated samples. Lanthanum‐deficient compositions were shown to exist as a two‐phase mixture with La2Si2O7 in equilibrium, although the powders prepared by solid state reaction at 1300°C do not indicate the significant presence of a secondary phase, regardless of the composition. The groove profiles with both a maximum and minimum (or hump) indicate the surface diffusion mechanism controlled by bulk defect chemistry and defect migration in the material. This phenomenon can be explained by the transport anisotropy in La diffusion which controls the matter transport by the bulk ambipolar diffusion mechanism, supported by recent theoretical as well as experimental studies. Electron backscattered diffraction mapping clearly correlated the grains perpendicular to the c‐axis with the strong development of thermal grooving and vice versa by the transport anisotropy. There is little indication of the surface and grain‐boundary energy anisotropy regardless of the compositions.

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“…Mg, Sr, Ba as alkaline earth metal [7,9,10] are widely used to substitute the La position, and Sr is the most common element [11,12] due to its similar chemical properties with La. As an example of Sr substitution is the Sr-doped apatite-type lanthanum silicates (La 9 Sr 1 Si 6 O 26.5 ) synthesized by Bonhomme et al [13]. A large number of works are also focused on the Si position doping.…”

Section: Introductionmentioning

confidence: 99%

“…(La 10Àx Sr x (Si,Ge) 6 in the table represents La 10Àx Sr x (Si,Ge) 6 O 27À0.5x for short, similarly hereinafter.) (La 10 Sr 0 )Ge 6 [14] (La 10 Sr 0 )Si 6 [8,30] (La 9 Sr 1 )Si 6 [13] (La 8 Sr 2 )Si 6 [8,30] Ionic conductivity (S cm À1 , 700°C) …”

Section: Introductionmentioning

confidence: 99%

Ab initio study of La 10−x Sr x (Si,Ge) 6 O 27−0.5x apatite for SOFC electrolyte

Fenineche

Elkedim

2015

Computational Materials Science

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Sintering kinetics and oxide ion conduction in Sr-doped apatite-type lanthanum silicates, La9Sr1Si6O26.5

Cited by 19 publications

References 23 publications

Preparation of aluminium lanthanum oxyapatite tapes, La10AlSi5O26.5, by tape casting and reaction sintering

Preparation of aluminium lanthanum oxyapatite tapes, La10AlSi5O26.5, by tape casting and reaction sintering

Effect of Crystallographic Anisotrophy and Lanthanum Stoichiometry on Microstructural Evolution of Lanthanum Silicate Electrolytes

Ab initio study of La 10−x Sr x (Si,Ge) 6 O 27−0.5x apatite for SOFC electrolyte

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