An excellent oxide ion conductivity with high oxygen transportation of lanthanum silicate apatite at the solid oxide fuel cell (SOFC) can be achieved through the solid-state reaction method. The doped La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ (x = 0.2 and 0.4) materials sintered at 1600°C accomplished crystallinity and crystal structure of apatite-type. The structural and electrochemical characterizations of La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ (x = 0.2 and 0.4) were executed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS) measurements. The total oxide ion conductivities of La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ (x = 0.2 and 0.4) were measured from low to intermediate operating temperature range (450 to 800°C) using electrochemical impedance spectroscopy. Room temperature XRD patterns of La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ (x = 0.2 and 0.4) exhibited La₁₀Si₆O₂₇ apatite phase with space group P6₃/m as the main phase with the minor appearance of La₂SiO₅ as an impurity phase. The highest total oxide ion conductivity of 3.24 × 10⁻³ Scm⁻¹ and corresponding activation energy of 0.30 eV at 800°C were obtained for La₁₀Si_5.6Al_0.2Zn_0.2O_26.7 which contains a low concentration of Al³⁺ dopant.

中文翻译：

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固体氧化物燃料电池硅酸镧磷灰石La10Si6-x-0.2AlxZn0.2O27-δ的结构和电化学性质

通过固态反应方法，可以实现在固态氧化物燃料电池（SOFC）处具有高氧迁移率的硅酸镧磷灰石的高氧离子传导性。 在1600℃下烧结的掺杂La ₁₀ Si _{6- x -0.2} Al _x Zn _0.2 O _{27- δ}（x = 0.2和0.4）材料实现了磷灰石型的结晶性和晶体结构。La ₁₀ Si _{6- x -0.2} Al _x Zn _0.2 O _{27- δ}（x的结构和电化学表征 分别使用X射线衍射（XRD），扫描电子显微镜（SEM），能量色散X射线光谱法（EDX）和电化学阻抗光谱（EIS）测量执行= = 0.2和0.4）。 使用电化学阻抗光谱法，从低至中间工作温度范围（450至800°C）测量了La ₁₀ Si _{6- x -0.2} Al _x Zn _0.2 O _{27- δ}（x = 0.2和0.4）的总氧化物离子电导率。La ₁₀ Si _{6− x -0.2} Al _x Zn _0.2 O _{27− δ}（x  ＝ 0.2和0.4）表现出以空间群P 6 ₃ / m为主要相的La ₁₀ Si ₆ O ₂₇磷灰石相，以La ₂ SiO ₅为杂质相的现象较少。对于包含低浓度的Al ³⁺掺杂剂的La ₁₀ Si _5.6 Al _0.2 Zn _0.2 O _26.7，在800℃时具有最高的总氧化物离子电导率3.24×10 ^-3 Scm ^-1和0.30 eV的活化能。