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<p>The Ca<sup>2+</sup> and Y<sup>3+</sup> co-doped ceria Ce<sub>0.8</sub>Y<sub>(0.12−x)</sub>Ca<sub>(0.08+x)</sub>O<sub>(2−δ)</sub> (x = 0.00,0.02,0.04,0.06) powder materials were prepared by solid-phase synthesis method. They were pressed and sintered at 1350&#xa0;°C for 5&#xa0;h to obtain circular sheet-like ceramics with relative densities greater than 95%. The phase structure of the prepared ceramics was identified using powder X-ray diffraction (XRD), and it was found that all samples were pure cubic phase. As x increased, the lattice constant first increased and then decreased. The microstructure of the ceramic surface was observed using field emission scanning electron microscopy (FESEM), it was found that they were all relatively dense. The change in the co-doping content of Ca<sup>2+</sup> and Y<sup>3+</sup> had a slight impact on the microstructure. As x increased, the size of large grains decreased, while the amount of small grains also decreased. By testing impedance spectroscopy, the electrical properties of different samples were studied, and it was found that as x increases, the conductivity first gradually increases and then decreases, reaching its maximum at x = 0.04. The gradual increase in conductivity is related to the increasing amounts of oxygen vacancies, average binding energy (ABE), and oxygen vacancy radius. The decrease in conductivity of the sample with x = 0.06 may be related to the relatively large elastic strain and Coulomb stress between defect pairs. The sample with x = 0.04 has the highest conductivity, reaching 24.6 mS/cm at 700&#xa0;°C, which is higher than the conductivity of YSZ at the same temperature.</p>

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Effect of Ca2+ and Y3+ co-doping on the electrical properties of Ce0.8Y(0.12-x)Ca(0.08+x)O(2-δ) electrolyte ceramics

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Bin Yang,
  • Ruili Jing,
  • Biaoxi Guan,
  • Dan Li,
  • Bingge Wang,
  • Fuxi Zhang

摘要

The Ca2+ and Y3+ co-doped ceria Ce0.8Y(0.12−x)Ca(0.08+x)O(2−δ) (x = 0.00,0.02,0.04,0.06) powder materials were prepared by solid-phase synthesis method. They were pressed and sintered at 1350 °C for 5 h to obtain circular sheet-like ceramics with relative densities greater than 95%. The phase structure of the prepared ceramics was identified using powder X-ray diffraction (XRD), and it was found that all samples were pure cubic phase. As x increased, the lattice constant first increased and then decreased. The microstructure of the ceramic surface was observed using field emission scanning electron microscopy (FESEM), it was found that they were all relatively dense. The change in the co-doping content of Ca2+ and Y3+ had a slight impact on the microstructure. As x increased, the size of large grains decreased, while the amount of small grains also decreased. By testing impedance spectroscopy, the electrical properties of different samples were studied, and it was found that as x increases, the conductivity first gradually increases and then decreases, reaching its maximum at x = 0.04. The gradual increase in conductivity is related to the increasing amounts of oxygen vacancies, average binding energy (ABE), and oxygen vacancy radius. The decrease in conductivity of the sample with x = 0.06 may be related to the relatively large elastic strain and Coulomb stress between defect pairs. The sample with x = 0.04 has the highest conductivity, reaching 24.6 mS/cm at 700 °C, which is higher than the conductivity of YSZ at the same temperature.