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<p>Herein, we report the development of Sr<sup>2+</sup> and Co<sup>2+</sup> co-substituted LaFeO<sub>3</sub> perovskite nanoparticles prepared using a sucrose-assisted sol-gel auto-combustion route for advanced dielectric ceramic capacitor applications. Incorporating Sr<sup>2+</sup> and Co<sup>2+</sup> ions into La<sub>1− <i>x</i></sub>Sr<sub><i>x</i></sub>Fe<sub>1−<i>y</i></sub>Co<sub><i>y</i></sub>O<sub>3</sub> (<i>x</i> = <i>y</i> = 0.0, 0.1, 0.2, 0.3, and 0.5) enhanced their structural, electrical, and dielectric properties. XRD and FTIR analyses confirmed lattice distortion, mixed valence states, and bond strengthening, contributing to improved charge carrier mobility and polarization mechanisms. TEM showed quasi-spherical nanoparticles (~ 15&#xa0;nm), while magnetic measurements indicated weak ferromagnetic ordering attributed to double exchange interactions (Fe<sup>2+</sup>–O–Fe<sup>3+</sup>). Dielectric studies demonstrated a significant enhancement in the dielectric constant (ε′) and a reduction in dielectric loss (tanδ) for co-substituted samples. The La<sub>1− <i>x</i></sub>Sr<sub><i>x</i></sub>Fe<sub>1−<i>y</i></sub>Co<sub><i>y</i></sub>O<sub>3</sub> (x = y = 0.2) sample exhibited the most optimized performance, showing high capacitance stability over a wide frequency range (1&#xa0;kHz to 2&#xa0;MHz) and a superior energy storage density of ~ 650&#xa0;J/m³ at 600&#xa0;K. Additionally, the energy storage efficiency reached ~ 90% at higher frequencies, further reinforcing its suitability for capacitor applications. These findings confirm that Sr<sup>2+</sup> and Co<sup>2+</sup> co-substituted LaFeO<sub>3</sub> perovskites, particularly the <i>x</i> = <i>y</i> = 0.2 composition, are promising candidates for dielectric ceramic capacitors in electronics at high-temperature energy storage applications.</p> Graphical abstract <p></p>

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Structural, magnetic, electrical, dielectric, and energy density properties of Sr2+ and Co2+ co-substituted LaFeO3 perovskites for dielectric ceramic capacitor applications

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • M. A. Gabal,
  • D. S. Alosaimi,
  • Y. M. Al Angari,
  • A. Awad,
  • A. A. Al-Juaid,
  • Saleh A. Alghamdi,
  • Abdu Saeed

摘要

Herein, we report the development of Sr2+ and Co2+ co-substituted LaFeO3 perovskite nanoparticles prepared using a sucrose-assisted sol-gel auto-combustion route for advanced dielectric ceramic capacitor applications. Incorporating Sr2+ and Co2+ ions into La1− xSrxFe1−yCoyO3 (x = y = 0.0, 0.1, 0.2, 0.3, and 0.5) enhanced their structural, electrical, and dielectric properties. XRD and FTIR analyses confirmed lattice distortion, mixed valence states, and bond strengthening, contributing to improved charge carrier mobility and polarization mechanisms. TEM showed quasi-spherical nanoparticles (~ 15 nm), while magnetic measurements indicated weak ferromagnetic ordering attributed to double exchange interactions (Fe2+–O–Fe3+). Dielectric studies demonstrated a significant enhancement in the dielectric constant (ε′) and a reduction in dielectric loss (tanδ) for co-substituted samples. The La1− xSrxFe1−yCoyO3 (x = y = 0.2) sample exhibited the most optimized performance, showing high capacitance stability over a wide frequency range (1 kHz to 2 MHz) and a superior energy storage density of ~ 650 J/m³ at 600 K. Additionally, the energy storage efficiency reached ~ 90% at higher frequencies, further reinforcing its suitability for capacitor applications. These findings confirm that Sr2+ and Co2+ co-substituted LaFeO3 perovskites, particularly the x = y = 0.2 composition, are promising candidates for dielectric ceramic capacitors in electronics at high-temperature energy storage applications.

Graphical abstract