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<p>The effects of Al<sup>3+</sup> substitution for Ni<sup>2+</sup> on microstructure and electrical properties of Li<sub>0.05</sub>Ni<sub>0.95-<i>x</i></sub>Al<sub><i>x</i></sub>O ceramics were investigated. Doping with the higher-valence Al<sup>3+</sup> cation promotes the reduction of Ni<sup>3+</sup> to Ni<sup>2+</sup>, thereby increasing the Ni<sup>2+</sup> content. At low Al<sup>3+</sup> content, the promotion in Ni<sup>2+</sup> content dominates, and its high ionic mobility benefits sintering and refines the grain size. Consequently, the Li<sub>0.05</sub>Ni<sub>0.94</sub>Al<sub>0.01</sub>O ceramic exhibits a minimum average grain size of 1.55 μm, the lowest resistivity of 2.86 Ω·cm, a resistance temperature coefficient of 7.2 × 10<sup>–3</sup>&#xa0;°C<sup>−1</sup>, and a nonlinear coefficient of 1.025. Finally, the actual pulsed charging-discharging test demonstrated a fast energy transmission speed (<i>t</i><sub>0.9</sub> &lt; 100&#xa0;ns), confirming the high potential of Li<sub>0.05</sub>Ni<sub>0.95</sub>O-based linear ceramic resistors for pulsed power systems.</p>

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Effect of Al3+ content on the characteristics of Li0.05Ni0.95O linear ceramic resistors for pulsed power applications

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Yan Yang,
  • Mengshi Zeng,
  • Juan Zeng

摘要

The effects of Al3+ substitution for Ni2+ on microstructure and electrical properties of Li0.05Ni0.95-xAlxO ceramics were investigated. Doping with the higher-valence Al3+ cation promotes the reduction of Ni3+ to Ni2+, thereby increasing the Ni2+ content. At low Al3+ content, the promotion in Ni2+ content dominates, and its high ionic mobility benefits sintering and refines the grain size. Consequently, the Li0.05Ni0.94Al0.01O ceramic exhibits a minimum average grain size of 1.55 μm, the lowest resistivity of 2.86 Ω·cm, a resistance temperature coefficient of 7.2 × 10–3 °C−1, and a nonlinear coefficient of 1.025. Finally, the actual pulsed charging-discharging test demonstrated a fast energy transmission speed (t0.9 < 100 ns), confirming the high potential of Li0.05Ni0.95O-based linear ceramic resistors for pulsed power systems.