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<p>This study employed the sol-gel assisted spin coating method to prepare strontium calcium titanate thin films with Sr<sub>0.62</sub>Ca<sub>0.38</sub>TiO<sub>3</sub> composition. XRD and AFM were used to characterize the phase formation and crystallite size and the grain size and surface roughness, respectively. The XRD pattern revealed an orthorhombic phase with an average crystallite size of 47 nm. The root-mean-square (R<sub>q</sub>) and average roughness (R<sub>a</sub>) values were 7.5 nm and 5.9 nm, respectively. Furthermore, the thin film exhibited a quite stable dielectric permittivity (ε′) ≈ 186 over a wide frequency range between 100 Hz and 1 MHz with 5% frequency dispersion. The dielectric loss tangent (tanδ) remained lower than 0.5 between 100 Hz and 1 MHz. The polarization cycle revealed a very high energy recovery density (U<sub>e</sub>) of 120 J/cm<sup>3</sup> under an applied field of 6000 kV/cm. These results demonstrate the high interest in Sr<sub>0.62</sub>Ca<sub>0.38</sub>TiO<sub>3</sub> oxide for electrostatic energy storage applications and its exceptional resistance to breakdown.</p> Graphical Abstract <p></p>

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Frequency-dependent dielectric properties and high-energy storage performance of strontium calcium titanate thin films synthesized via sol-gel-assisted spin coating technique

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Parthiban Palani,
  • Didier Fasquelle

摘要

This study employed the sol-gel assisted spin coating method to prepare strontium calcium titanate thin films with Sr0.62Ca0.38TiO3 composition. XRD and AFM were used to characterize the phase formation and crystallite size and the grain size and surface roughness, respectively. The XRD pattern revealed an orthorhombic phase with an average crystallite size of 47 nm. The root-mean-square (Rq) and average roughness (Ra) values were 7.5 nm and 5.9 nm, respectively. Furthermore, the thin film exhibited a quite stable dielectric permittivity (ε′) ≈ 186 over a wide frequency range between 100 Hz and 1 MHz with 5% frequency dispersion. The dielectric loss tangent (tanδ) remained lower than 0.5 between 100 Hz and 1 MHz. The polarization cycle revealed a very high energy recovery density (Ue) of 120 J/cm3 under an applied field of 6000 kV/cm. These results demonstrate the high interest in Sr0.62Ca0.38TiO3 oxide for electrostatic energy storage applications and its exceptional resistance to breakdown.

Graphical Abstract