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<p>The rapid advancement in miniaturized electronic devices requires advanced multilayer ceramic capacitors (MLCCs), constituting ultra-thin dielectric layers that exhibit high capacitance and reliable performance. BaTiO<sub>3</sub> (BT)-based ceramics, widely utilized due to their high permittivity, face significant challenges in controlling grain growth and dielectric stability during sintering. In this study, we propose a novel core-shell structuring approach using Ca<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> (CN) nanosheets to encapsulate BT nanoparticles, effectively maintaining fine-grained microstructures on the order of the starting BT particle size after sintering. The addition of CN nanosheets resulted in relaxor-like dielectric behaviors by broadening and suppressing the dielectric anomaly upon the ferroelectric-paraelectric phase transition near 120&#xa0;°C. Importantly, ceramics sintered via a Two-step sintering (TSS) process demonstrated significantly enhanced permittivity (~ 2,100 at room temperature), dense microstructures (&gt; 95% relative density), and preserved core-shell structures compared to conventional sintering. These findings confirm the effectiveness of CN nanosheet-assisted diffusion control in engineering advanced BT-based ceramics with enhanced electrical stability under high electric fields and optimized dielectric performance suitable for MLCC applications.</p>

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Enhanced dielectric performance in BaTiO3 ceramics by diffusion-controlled core-shell structuring with 2D Ca2Nb3O10 nanosheets

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Tae Yeong Song,
  • Junwon Lee,
  • Nayeon Kwon,
  • Do-Kyun Kwon

摘要

The rapid advancement in miniaturized electronic devices requires advanced multilayer ceramic capacitors (MLCCs), constituting ultra-thin dielectric layers that exhibit high capacitance and reliable performance. BaTiO3 (BT)-based ceramics, widely utilized due to their high permittivity, face significant challenges in controlling grain growth and dielectric stability during sintering. In this study, we propose a novel core-shell structuring approach using Ca2Nb3O10 (CN) nanosheets to encapsulate BT nanoparticles, effectively maintaining fine-grained microstructures on the order of the starting BT particle size after sintering. The addition of CN nanosheets resulted in relaxor-like dielectric behaviors by broadening and suppressing the dielectric anomaly upon the ferroelectric-paraelectric phase transition near 120 °C. Importantly, ceramics sintered via a Two-step sintering (TSS) process demonstrated significantly enhanced permittivity (~ 2,100 at room temperature), dense microstructures (> 95% relative density), and preserved core-shell structures compared to conventional sintering. These findings confirm the effectiveness of CN nanosheet-assisted diffusion control in engineering advanced BT-based ceramics with enhanced electrical stability under high electric fields and optimized dielectric performance suitable for MLCC applications.