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<p>La<sub>10−<i>x</i></sub>Y<sub><i>x</i></sub>Si<sub>6</sub>O<sub>27</sub> (<i>x</i> = 0, 0.1, 0.2, 0.3) ceramics were prepared by a two-step ball-milling method. This study aims to address the research gap in Y<sup>3+</sup> doping of lanthanum silicate systems by systematically investigating the synergistic effects of Y<sup>3+</sup> doping concentration on the phase structure stability, microstructural evolution, and total conduction behavior of apatite-type electrolyte materials. La<sub>10-<i>x</i></sub>Y<sub><i>x</i></sub>Si<sub>6</sub>O<sub>27</sub> belongs to the hexagonal apatite structure, while the La<sub>2</sub>SiO<sub>5</sub> secondary phase emerged when <i>x</i> ≥ 0.2. As the Y content continues to increase, a few pores appear in the sintered body, and Y ions are effectively integrated into the lattice of lanthanum silicate. The <i>x</i> = 0.1 sample demonstrates the maximum conductivity of 7.26 × 10<sup>-3</sup> S&#xa0;cm<sup>−1</sup> at 800°C, whereas the <i>x</i> = 0.2 composition shows an order-of-magnitude decrease in conductivity due to pore formation.</p>

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Effects of Y Doping on Phase Structure, Microstructure and Electrical Conductivity of La10−xYxSi6O27 (x = 0, 0.1, 0.2, 0.3)

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Dongliang Li,
  • Xiangnan Wang

摘要

La10−xYxSi6O27 (x = 0, 0.1, 0.2, 0.3) ceramics were prepared by a two-step ball-milling method. This study aims to address the research gap in Y3+ doping of lanthanum silicate systems by systematically investigating the synergistic effects of Y3+ doping concentration on the phase structure stability, microstructural evolution, and total conduction behavior of apatite-type electrolyte materials. La10-xYxSi6O27 belongs to the hexagonal apatite structure, while the La2SiO5 secondary phase emerged when x ≥ 0.2. As the Y content continues to increase, a few pores appear in the sintered body, and Y ions are effectively integrated into the lattice of lanthanum silicate. The x = 0.1 sample demonstrates the maximum conductivity of 7.26 × 10-3 S cm−1 at 800°C, whereas the x = 0.2 composition shows an order-of-magnitude decrease in conductivity due to pore formation.