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- W2331199033 abstract "We have successfully synthesized the highly c-axis-oriented polycrystals of apatite-type lanthanum silicate by the reactive diffusion technique. When the La2SiO5/La2Si2O7 diffusion couples were isothermally heated at 1773–1873 K for 5–100 h, the apatite polycrystals were readily produced in the form of a layer at the interfacial boundaries. The annealed couples were characterized using optical microscopy, micro-Raman spectroscopy, X-ray diffractometry, and electron probe microanalysis. The product layers were composed of the highly c-axis-oriented prismatic crystallites, with their elongation directions being almost parallel to the diffusion direction. The formation of the apatite layer was controlled by volume diffusion, the overall reaction of which is described by (10 + 6x)La2SiO5 + (4–3x)La2Si2O7 → 3La9.33+2x(SiO4)6O2+3x (0.01 ≤ x ≤ 0.13). The apatite layer formed at 1873 K was characterized by the steady decrease of the x-value along the diffusion direction from 0.13 at the La2SiO5/apatite interface to 0.01 at the apatite/La2Si2O7 interface. We have also prepared sandwich-type La2Si2O7/La2SiO5/La2Si2O7 diffusion couples and heated them at 1873 K for 100 h. The annealed couple was mechanically processed, and the thin-plate electrolyte consisting of the highly c-axis-oriented polycrystal was obtained. The oxide-ion conductivity was determined from the impedance spectroscopy data at 573–973 K, which steadily increased from 2.4 × 10–3 S/cm to 2.39 × 10–2 S/cm with increasing temperature. The empirical activation energy of conduction was 0.35 eV, which compares well with the calculated migration energy of 0.32 eV in a previous study." @default.
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- W2331199033 date "2011-11-22" @default.
- W2331199033 modified "2023-09-26" @default.
- W2331199033 title "Oxide-Ion Conductivity of Highly <i>c</i>-Axis-Oriented Apatite-Type Lanthanum Silicate Polycrystal Formed by Reactive Diffusion between La<sub>2</sub>SiO<sub>5</sub> and La<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>" @default.
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- W2331199033 doi "https://doi.org/10.1021/cm2029905" @default.
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