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<p>Na<sub>0.25</sub>Bi<sub>0.25</sub>Sr<sub>0.50</sub>Zr<sub>x</sub>Ti<sub>1-x</sub>O<sub>3</sub> (x = 0, 0.5, 1.0, 2.0&#xa0;mol%) ferroelectric ceramics was synthesized by traditional&#xa0;method to study impact of introducing Zr<sup>4+</sup> cation on structure and ferroelectric properties of NBST ceramic. With increasing amount of Zr<sup>4+</sup> into the NBST lattice average grain size is decreases from 0.96 to 0.83&#xa0;µm. Every composition had a mixed phase perovskite structure with tetragonal and rhombohedral symmetry. Fourier Transform Infrared (FTIR) spectroscopy and Raman Spectroscopy confirmed the structural changes. Optimum energy storage efficiency (η) = 92%,recoverable energy storage density (W<sub>rec</sub>) = 120.30&#xa0;kJ/m<sup>3</sup>, lowP<sub>r</sub> (remnant polarization) = 3.156&#xa0;μC/cm<sup>2</sup> and E<sub>C</sub>(coercive field) = 2.607&#xa0;kV/cm values were obtained for Na<sub>0.25</sub>Bi<sub>0.25</sub>Sr<sub>0.50</sub>Zr<sub>0.01</sub>Ti<sub>0.99</sub>O<sub>3</sub>(x = 1&#xa0;mol%) composition at 10&#xa0;kV/cm applied electric field which is suitable for lead free energy storage properties. While Na<sub>0.25</sub>Bi<sub>0.25</sub>Sr<sub>0.50</sub>Zr<sub>0.02</sub>Ti<sub>0.98</sub>O<sub>3</sub> (x = 2&#xa0;mol%) composition showed excellent thermal stability for dielectric&#xa0;constant and dielectric losses (&lt; 0.04) as well with TCC% ≤ ± 15% for temperature range (−&#xa0;30 to 230&#xa0;°C) and TCC% ≤ ± 20% for temperature range (−&#xa0;30° to 350&#xa0;°C) with very low dielectric losses (&lt; 0.04) up to 210&#xa0;°C at 1&#xa0;kHz frequency of applied field which is suitable for stable capacitor applications.</p>

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Phase transformation and enhanced thermal stability of giant dielectric constant with optimized breakdown strength on introducing Zr4+cation in Na0.25Bi0.25Sr0.50ZrxTi1-xO3 ceramics

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Deepa,
  • Neetu Ahlawat,
  • Pooja,
  • Kanika Rani,
  • Navneet Ahlawat

摘要

Na0.25Bi0.25Sr0.50ZrxTi1-xO3 (x = 0, 0.5, 1.0, 2.0 mol%) ferroelectric ceramics was synthesized by traditional method to study impact of introducing Zr4+ cation on structure and ferroelectric properties of NBST ceramic. With increasing amount of Zr4+ into the NBST lattice average grain size is decreases from 0.96 to 0.83 µm. Every composition had a mixed phase perovskite structure with tetragonal and rhombohedral symmetry. Fourier Transform Infrared (FTIR) spectroscopy and Raman Spectroscopy confirmed the structural changes. Optimum energy storage efficiency (η) = 92%,recoverable energy storage density (Wrec) = 120.30 kJ/m3, lowPr (remnant polarization) = 3.156 μC/cm2 and EC(coercive field) = 2.607 kV/cm values were obtained for Na0.25Bi0.25Sr0.50Zr0.01Ti0.99O3(x = 1 mol%) composition at 10 kV/cm applied electric field which is suitable for lead free energy storage properties. While Na0.25Bi0.25Sr0.50Zr0.02Ti0.98O3 (x = 2 mol%) composition showed excellent thermal stability for dielectric constant and dielectric losses (< 0.04) as well with TCC% ≤ ± 15% for temperature range (− 30 to 230 °C) and TCC% ≤ ± 20% for temperature range (− 30° to 350 °C) with very low dielectric losses (< 0.04) up to 210 °C at 1 kHz frequency of applied field which is suitable for stable capacitor applications.