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<p>With superior energy storage capabilities and environmentally benign characteristics, silver niobate (AN)-based lead-free antiferroelectric (AFE) ceramics have been identified as potential options for advanced energy storage systems. Nevertheless, the main drawbacks limiting its energy storage performance are its low recoverable energy density (<i>W</i><sub>rec</sub>) and low energy storage efficiency. In this research, the tape casting method was applied to prepare Ag<sub>0.94-3x</sub>La<sub>0.02</sub>Sm<sub>x</sub>NbO<sub>3</sub> (<i>x</i> = 0.01, 0.03, 0.05, 0.07) AFE ceramics where doping at the A-site with a smaller ionic radius Sm<sup>3+</sup> (0.124&#xa0;nm) replaced a portion of Ag<sup>+</sup> (0.148&#xa0;nm). This replacement increases the density of the sample, refines the grains, causes a certain degree of lattice distortion, reduces the tolerance factor, stabilizes the AFE phase, regulates the dielectric constant, and enhances the energy storage capability. As a result, the Ag<sub>0.79</sub>La<sub>0.02</sub>Sm<sub>0.05</sub>NbO<sub>3</sub> ceramics obtain the energy storage density of 4.32&#xa0;J/cm<sup>3</sup> and 51.39% of the energy storage efficiency (<i>η)</i> at 315&#xa0;kV/cm. This will provide a new way to improve the energy storage capabilities of AN-based AFE ceramics.</p>

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Effects of Sm3+ doping on the dielectric and energy storage properties of AgNbO3-based antiferroelectric ceramics

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Minli Chu,
  • Pinrong An,
  • Huilin Yang,
  • Chenxi Cai,
  • Qilinjia Mi

摘要

With superior energy storage capabilities and environmentally benign characteristics, silver niobate (AN)-based lead-free antiferroelectric (AFE) ceramics have been identified as potential options for advanced energy storage systems. Nevertheless, the main drawbacks limiting its energy storage performance are its low recoverable energy density (Wrec) and low energy storage efficiency. In this research, the tape casting method was applied to prepare Ag0.94-3xLa0.02SmxNbO3 (x = 0.01, 0.03, 0.05, 0.07) AFE ceramics where doping at the A-site with a smaller ionic radius Sm3+ (0.124 nm) replaced a portion of Ag+ (0.148 nm). This replacement increases the density of the sample, refines the grains, causes a certain degree of lattice distortion, reduces the tolerance factor, stabilizes the AFE phase, regulates the dielectric constant, and enhances the energy storage capability. As a result, the Ag0.79La0.02Sm0.05NbO3 ceramics obtain the energy storage density of 4.32 J/cm3 and 51.39% of the energy storage efficiency (η) at 315 kV/cm. This will provide a new way to improve the energy storage capabilities of AN-based AFE ceramics.