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<p>Fe-doped Al<sub>2</sub>O<sub>3</sub> nanocomposites (Al<sub>2−x</sub>Fe<sub>x</sub>O<sub>3</sub>, x = 0.00–0.30) were synthesized using a one-step hydrothermal method followed by calcination. X-ray diffraction (XRD) analysis indicates a systematic structural transformation from γ-Al<sub>2</sub>O<sub>3</sub> to α-Al<sub>2</sub>O<sub>3</sub> as Fe content increases, accompanied by lattice distortion. For Fe contents of x ≥ 0.15, weak additional reflections corresponding to a secondary Fe<sub>2</sub>O<sub>3</sub> phase are detected, while the Al<sub>2</sub>O<sub>3</sub> matrix remains predominant. The crystallite size decreases from approximately 45 to 25 nm, and both microstrain and dislocation density increase, as determined by <i>Williamson–Hall</i> analysis. Ultraviolet–visible (UV–Vis) diffuse reflectance measurements show a narrowing of the band gap from 2.14 to 1.95 eV. Temperature-dependent conductivity measurements indicate a reduction in activation energy from 0.65 to 0.45 eV. Collectively, these findings demonstrate that Fe-induced defect engineering, including the controlled formation of minor Fe<sub>2</sub>O<sub>3</sub>-related secondary phases, provides an effective strategy for tuning the optical and electronic properties of Al<sub>2</sub>O<sub>3</sub>.</p>

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Tailoring structural, optical, and electronic features of Fe-doped Al2O3 nanocomposites via hydrothermal synthesis and advanced characterization

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • M. F. Hasaneen,
  • J. Laifi,
  • Meshal Alzaid,
  • Mohammed Ezzeldien,
  • N. M. A. Hadia

摘要

Fe-doped Al2O3 nanocomposites (Al2−xFexO3, x = 0.00–0.30) were synthesized using a one-step hydrothermal method followed by calcination. X-ray diffraction (XRD) analysis indicates a systematic structural transformation from γ-Al2O3 to α-Al2O3 as Fe content increases, accompanied by lattice distortion. For Fe contents of x ≥ 0.15, weak additional reflections corresponding to a secondary Fe2O3 phase are detected, while the Al2O3 matrix remains predominant. The crystallite size decreases from approximately 45 to 25 nm, and both microstrain and dislocation density increase, as determined by Williamson–Hall analysis. Ultraviolet–visible (UV–Vis) diffuse reflectance measurements show a narrowing of the band gap from 2.14 to 1.95 eV. Temperature-dependent conductivity measurements indicate a reduction in activation energy from 0.65 to 0.45 eV. Collectively, these findings demonstrate that Fe-induced defect engineering, including the controlled formation of minor Fe2O3-related secondary phases, provides an effective strategy for tuning the optical and electronic properties of Al2O3.