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<p>Polycrystalline lead-free Ba<sub>0.65</sub>Sr<sub>0.35</sub>TiO₃ (BST) was synthesized using the solid-state reaction method, its structural characteristics, dielectric behavior, and energy storage capabilities were thoroughly examined. X-ray diffraction and Raman spectroscopy confirmed the formation of a pure perovskite structure with a tetragonal phase. The BST sample demonstrated a high dielectric constant of 8860 with low dielectric losses (&lt; 0.05) at 1&#xa0;kHz. It also exhibited excellent thermal stability, maintaining an energy storage efficiency of approximately 84% with less than 2% variation across the temperature range of 55 to 105&#xa0;°C under a moderate electric field of 37&#xa0;kV/cm. Moreover, a high recoverable energy density of 1.079&#xa0;J/cm³ was achieved at room temperature under an applied electric field of 135&#xa0;kV/cm. The electrocaloric effect (ECE) was indirectly evaluated, revealing a significant temperature change (ΔT = 1.18&#xa0;K) and an entropy change (ΔS = 1.32&#xa0;J/kg·K). This study highlights the potential of BST ceramics as a promising lead-free alternative for solid-state refrigeration and energy storage applications in dielectric capacitors operating at room temperature.</p>

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Enhancement of thermal stability of energy storage performances and electrocaloric effect in lead-free Ba0.65Sr0.35TiO3 ceramic

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • S. Khardazi,
  • S. Ben Moumen,
  • S. Elmouloua,
  • H. Mezzourh,
  • Y. Hadouch,
  • D. Mezzane,
  • M. Amjoud,
  • B. Rožič,
  • Z. Kutnjak,
  • S. Terenchuk,
  • I. Lukyanchuk

摘要

Polycrystalline lead-free Ba0.65Sr0.35TiO₃ (BST) was synthesized using the solid-state reaction method, its structural characteristics, dielectric behavior, and energy storage capabilities were thoroughly examined. X-ray diffraction and Raman spectroscopy confirmed the formation of a pure perovskite structure with a tetragonal phase. The BST sample demonstrated a high dielectric constant of 8860 with low dielectric losses (< 0.05) at 1 kHz. It also exhibited excellent thermal stability, maintaining an energy storage efficiency of approximately 84% with less than 2% variation across the temperature range of 55 to 105 °C under a moderate electric field of 37 kV/cm. Moreover, a high recoverable energy density of 1.079 J/cm³ was achieved at room temperature under an applied electric field of 135 kV/cm. The electrocaloric effect (ECE) was indirectly evaluated, revealing a significant temperature change (ΔT = 1.18 K) and an entropy change (ΔS = 1.32 J/kg·K). This study highlights the potential of BST ceramics as a promising lead-free alternative for solid-state refrigeration and energy storage applications in dielectric capacitors operating at room temperature.