Scholarlink

<p>This work systematically investigates the effect of sintering strategy on the functional performance of Sb-doped K₀.₅Na₀.₅NbO₃ (KNN) lead-free ceramics for piezoelectric energy harvesting. Ceramics were fabricated using both conventional single-step sintering and an optimized two-step sintering (TSS) approach to assess the impact of these methods on phase purity, microstructure, and electromechanical properties. X-ray diffraction and Raman spectroscopy confirmed the stabilization of a single-phase orthorhombic perovskite structure across all sintering conditions. While conventional sintering yielded a high dielectric permittivity, it also led to significant dielectric loss and leakage current. The TSS route, by contrast, enabled precise control of grain growth and defect chemistry. Among all compositions, the optimally sintered TSS sample (K3) exhibited a dense, fine-grained microstructure, enhanced dielectric performance (ε<sub>r</sub> ≈ 206, tan δ ≈ 0.55 at 1&#xa0;kHz), suppressed leakage current (~ 9.4 µA·cm⁻²), and improved thermal stability (ferroelectric transition ~ 440&#xa0;°C). Raman analysis indicated moderate lattice disorder beneficial for domain dynamics without structural degradation. The K3-based piezoelectric nanogenerator (PENG) achieved a peak output of 4.8&#xa0;V and 6.25 µW under finger-tapping, outperforming the conventionally sintered counterpart. These findings underscore the superiority of the TSS method over conventional routes, demonstrating its potential to optimize the performance and reliability of lead-free KNN ceramics in practical energy-harvesting applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of sintering strategies on the structural and electrical properties of Sb-doped K0.5Na0.5NbO3 lead-free ceramics for energy harvesting

  • 期刊论文

  • 发表日期：

    2026年6月19日

查看全文
  • Prasanna Kumari Tanapaneni,
  • R. Padma Suvarna,
  • Annapureddy Venkateswarlu

摘要

This work systematically investigates the effect of sintering strategy on the functional performance of Sb-doped K₀.₅Na₀.₅NbO₃ (KNN) lead-free ceramics for piezoelectric energy harvesting. Ceramics were fabricated using both conventional single-step sintering and an optimized two-step sintering (TSS) approach to assess the impact of these methods on phase purity, microstructure, and electromechanical properties. X-ray diffraction and Raman spectroscopy confirmed the stabilization of a single-phase orthorhombic perovskite structure across all sintering conditions. While conventional sintering yielded a high dielectric permittivity, it also led to significant dielectric loss and leakage current. The TSS route, by contrast, enabled precise control of grain growth and defect chemistry. Among all compositions, the optimally sintered TSS sample (K3) exhibited a dense, fine-grained microstructure, enhanced dielectric performance (εr ≈ 206, tan δ ≈ 0.55 at 1 kHz), suppressed leakage current (~ 9.4 µA·cm⁻²), and improved thermal stability (ferroelectric transition ~ 440 °C). Raman analysis indicated moderate lattice disorder beneficial for domain dynamics without structural degradation. The K3-based piezoelectric nanogenerator (PENG) achieved a peak output of 4.8 V and 6.25 µW under finger-tapping, outperforming the conventionally sintered counterpart. These findings underscore the superiority of the TSS method over conventional routes, demonstrating its potential to optimize the performance and reliability of lead-free KNN ceramics in practical energy-harvesting applications.