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<p>This research investigates sol–gel auto-combustion synthesized Sr<sub>1-x</sub>La<sub>x</sub>Fe<sub>12-y</sub>Bi<sub>y</sub>O<sub>19</sub> (<i>x</i> = 0–0.25, <i>y</i> = 0–0.5) nanoparticles, focusing on La<sup>3+</sup> and Bi<sup>3+</sup> co-substitution effects on structural and dielectric properties. X-ray diffraction confirms a single-phase M-type hexagonal ferrite structure (space group <i>P</i>6<sub>3</sub>/<i>mmc</i>) with crystallite sizes decreasing from 20 to 13&#xa0;nm and lattice parameters increasing from 682.08 to 704.73&#xa0;Å upon La<sup>3+</sup> and Bi<sup>3+</sup> co-substitution. Field-emission scanning electron microscopy analysis reveals that the La/Bi substitution results in changes to the morphology and particle size of the samples. Dielectric properties analyzed using impedance spectroscopy reveal a decreased real part of dielectric permittivity with increasing frequency and co-substitution, attributable to interfacial polarization and microstructural changes. The imaginary parts of the electrical modulus diagram exhibit a relaxation peak shift towards lower frequencies with co-substitution, indicating enhanced charge carrier mobility and Debye dielectric response. Findings offer comprehensive insights for tailoring properties in energy storage devices, electronic components, and related fields.</p>

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Impact of La–Bi co-substitution on the structural, morphological, and dielectric properties of SrFe12O19: a comprehensive study

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Ahmad Gholizadeh

摘要

This research investigates sol–gel auto-combustion synthesized Sr1-xLaxFe12-yBiyO19 (x = 0–0.25, y = 0–0.5) nanoparticles, focusing on La3+ and Bi3+ co-substitution effects on structural and dielectric properties. X-ray diffraction confirms a single-phase M-type hexagonal ferrite structure (space group P63/mmc) with crystallite sizes decreasing from 20 to 13 nm and lattice parameters increasing from 682.08 to 704.73 Å upon La3+ and Bi3+ co-substitution. Field-emission scanning electron microscopy analysis reveals that the La/Bi substitution results in changes to the morphology and particle size of the samples. Dielectric properties analyzed using impedance spectroscopy reveal a decreased real part of dielectric permittivity with increasing frequency and co-substitution, attributable to interfacial polarization and microstructural changes. The imaginary parts of the electrical modulus diagram exhibit a relaxation peak shift towards lower frequencies with co-substitution, indicating enhanced charge carrier mobility and Debye dielectric response. Findings offer comprehensive insights for tailoring properties in energy storage devices, electronic components, and related fields.