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<p>The conventional solid-state reaction technique was used to create the lead-free ceramic composition of 0.63Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>–0.37SrTiO<sub>3</sub>–NaNbO<sub>3</sub>. A single-phase monoclinic crystal structure with <i>Cc</i> symmetry and a tetragonal <i>P4mm</i> phase has been confirmed using X-ray diffraction studies. Polarization and strain evaluated under an applied electric field have been employed to demonstrate whether these ceramics switched from ferroelectric to antiferroelectric characteristics. Surprisingly, with an electric field of 25&#xa0;kV/cm, the induced electrocaloric effect (ECE) for the 0.63Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>–0.37SrTiO<sub>3</sub>–NaNbO<sub>3</sub> ceramic exhibited a notable temperature change (ΔT) that was nearly 2.59&#xa0;K. Furthermore, a high energy density of 3.96&#xa0;J/cm<sup>3</sup> and efficiency of 80.13% were observed throughout a broad range of temperatures and frequencies, from 30&#xa0;°C to 150&#xa0;°C and 1&#xa0;Hz, respectively, using an electric field with an intensity of 150&#xa0;kV/cm. The ECE response and isothermal entropy change (ΔS) occurring simultaneously suggest that there is a great deal of potential for use in electronic devices.</p>

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Improvment of electrocaloric energy storage properties in eco-friendly 0.63Na0.5Bi0.5TiO3-0.37SrTiO3-NaNbO3 ceramic synthesized by sol–gel route

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • P. Eswara Satyanarayana,
  • Kasaram Roja,
  • N. Giridhar Babu,
  • Bharat Kumar Dhangar,
  • Sk. Akram,
  • G. Bhanu kiran,
  • Thiriveedhi Narendrudu,
  • N. Ch. Ramesh Babu,
  • A. Kalpana

摘要

The conventional solid-state reaction technique was used to create the lead-free ceramic composition of 0.63Na0.5Bi0.5TiO3–0.37SrTiO3–NaNbO3. A single-phase monoclinic crystal structure with Cc symmetry and a tetragonal P4mm phase has been confirmed using X-ray diffraction studies. Polarization and strain evaluated under an applied electric field have been employed to demonstrate whether these ceramics switched from ferroelectric to antiferroelectric characteristics. Surprisingly, with an electric field of 25 kV/cm, the induced electrocaloric effect (ECE) for the 0.63Na0.5Bi0.5TiO3–0.37SrTiO3–NaNbO3 ceramic exhibited a notable temperature change (ΔT) that was nearly 2.59 K. Furthermore, a high energy density of 3.96 J/cm3 and efficiency of 80.13% were observed throughout a broad range of temperatures and frequencies, from 30 °C to 150 °C and 1 Hz, respectively, using an electric field with an intensity of 150 kV/cm. The ECE response and isothermal entropy change (ΔS) occurring simultaneously suggest that there is a great deal of potential for use in electronic devices.