Abstract Present work mainly deals with two important aspects of co-doped ceria based solid electrolytes. First, the occurrence of micro-strain or structural distortions in ceria lattice on doping of Dy3+ and Ca2+ at the place of Ce4+. Second, an enhancement in electrical conductivity by formation of nano-composites of Ce0.83Dy0.14Ca0.03O1.90 (CDC) and eutectic mixture of sodium and lithium carbonates [(Li0.52Na0.48)2CO3] (LNCO). CDC ceramic powder was synthesized by citrate-nitrate auto-combustion route. Nano-composites were prepared by mixing the CDC powder with LNCO using a ball mill. X-ray diffraction studies were carried out to analyze the crystal structure of CDC and to study the amorphous nature of carbonates in the nanocomposites. Thermal behavior of the nanocomposites was studied by differential scanning calorimetry (DSC). XRD data of CDC were refined by Rietveld analysis to determine the lattice parameters, atomic positions, bond lengths, bond angles, oxygen deficiency and possible micro-strain. Microstructures of the specimens were studied using scanning electron microscope. Electrical conductivity of the nanocomposites was investigated by using complex plane impedance analysis. A significant improvement in electrical conductivity was observed in nanocomposites with varying concentration of carbonates. Maximum conductivity, 1.05 × 10−1 S cm−1 at 500 °C, was observed in the composite with 30 wt% (CDC/30LNCO) of carbonates content.

中文翻译：

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Ce 0.83 Dy 0.14 Ca 0.03 O 1.90 (CDC) 的结构分析及其与碱金属碳酸盐的复合材料用于 LT-SOFC 的增强电导率

摘要 目前的工作主要涉及共掺杂氧化铈基固体电解质的两个重要方面。首先，在Ce4+位置掺杂Dy3+和Ca2+时，二氧化铈晶格出现微应变或结构畸变。其次，通过形成 Ce0.83Dy0.14Ca0.03O1.90 (CDC) 和碳酸钠和碳酸锂的共晶混合物 [(Li0.52Na0.48)2CO3] (LNCO) 的纳米复合材料来增强导电性。CDC陶瓷粉体采用柠檬酸-硝酸盐自燃路线合成。通过使用球磨机将 CDC 粉末与 LNCO 混合来制备纳米复合材料。进行 X 射线衍射研究以分析 CDC 的晶体结构并研究纳米复合材料中碳酸盐的无定形性质。通过差示扫描量热法（DSC）研究纳米复合材料的热行为。通过 Rietveld 分析对 CDC 的 XRD 数据进行细化，以确定晶格参数、原子位置、键长、键角、缺氧和可能的微应变。使用扫描电子显微镜研究样品的显微结构。通过使用复平面阻抗分析来研究纳米复合材料的电导率。在具有不同浓度碳酸盐的纳米复合材料中观察到电导率的显着改善。在碳酸盐含量为 30 wt% (CDC/30LNCO) 的复合材料中观察到最大电导率，500 °C 时为 1.05 × 10-1 S cm-1。使用扫描电子显微镜研究样品的显微结构。通过使用复平面阻抗分析来研究纳米复合材料的电导率。在具有不同浓度碳酸盐的纳米复合材料中观察到电导率的显着改善。在碳酸盐含量为 30 wt% (CDC/30LNCO) 的复合材料中观察到最大电导率，500 °C 时为 1.05 × 10-1 S cm-1。使用扫描电子显微镜研究样品的显微结构。通过使用复平面阻抗分析来研究纳米复合材料的电导率。在具有不同浓度碳酸盐的纳米复合材料中观察到电导率的显着改善。在碳酸盐含量为 30 wt% (CDC/30LNCO) 的复合材料中观察到最大电导率，500 °C 时为 1.05 × 10-1 S cm-1。