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<p>Nickel ferrite (NiFe₂O₄) nanostructures with a cubic spinel phase were synthesized via sol–gel and calcined at 400–800℃ to study temperature effects on structure and magnetism. XRD confirmed single-phase formation with improved crystallinity, while crystallite size grew from 10 to 55&#xa0;nm. TEM showed uniform 44&#xa0;nm nanoparticles at 800℃. FTIR indicated characteristic Fe–O and Ni–O vibrations. Magnetic measurements revealed increased anisotropy (1.51 × 10<sup>3</sup> to 4.33 × 10<sup>3</sup>&#xa0;J/m<sup>3</sup>) and magnetic moment (1.43–2.01&#xa0;μB), reflecting enhanced spin alignment. Thermal treatment at 800℃ optimized the crystallinity and magnetic performance, making the material relevant for future magnetic and electromagnetic applications.</p> Graphical abstract <p></p>

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Correlation between thermal treatment, spinel integrity, and magnetic enhancement in NiFe2O4 ferrite nanostructures

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Thoraya Maamoun Elhelali Ali

摘要

Nickel ferrite (NiFe₂O₄) nanostructures with a cubic spinel phase were synthesized via sol–gel and calcined at 400–800℃ to study temperature effects on structure and magnetism. XRD confirmed single-phase formation with improved crystallinity, while crystallite size grew from 10 to 55 nm. TEM showed uniform 44 nm nanoparticles at 800℃. FTIR indicated characteristic Fe–O and Ni–O vibrations. Magnetic measurements revealed increased anisotropy (1.51 × 103 to 4.33 × 103 J/m3) and magnetic moment (1.43–2.01 μB), reflecting enhanced spin alignment. Thermal treatment at 800℃ optimized the crystallinity and magnetic performance, making the material relevant for future magnetic and electromagnetic applications.

Graphical abstract