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<p>Scheelite-type alkaline-earth tungstates (AWO<sub>4</sub>) are multifunctional materials, but controlling their properties through defect engineering remains a challenge. This study presents a facile, surfactant-free co-precipitation synthesis of strontium tungstate (Sr<sub>x</sub>WO<sub>4</sub>) nanoparticles with precise control over Sr<sup>2</sup>⁺ doping ratio (x = 0.1, 0.3, 0.5, 1.0). Comprehensive characterization reveals that Sr<sup>2</sup>⁺ incorporation induces a phase transformation to a tetragonal scheelite SrWO<sub>4</sub> structure. Crucially, the crystallinity and hierarchical microsphere morphology are strongly dependent on Sr content, with intermediate concentrations leading to smaller, defect-rich crystallites. The optical band gap was tuned between 3.83 and 3.86&#xa0;eV, with the narrowing and widening trends correlated to defect states and the Burstein-Moss effect, respectively. Photoluminescence spectroscopy exhibited broad, multicolor emission, directly confirming the presence of oxygen vacancies and defect states. Crucially, room-temperature ferromagnetism was observed, a significant deviation from the diamagnetic nature of pristine WO₃. The saturation magnetization and coercivity showed a non-monotonic relationship with Sr content, which is interpreted as a defect-mediated phenomenon driven primarily by oxygen vacancies. The synergistic combination of tunable bandgap, defect-rich luminescence, and emergent ferromagnetism positions these Sr<sub>x</sub>WO<sub>4</sub> nanoparticles as highly promising candidates for advanced magneto-optical and spintronic devices.</p>

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Synthesis, optical, and magnetic properties of SrxWO4 nanomaterials for advanced functional devices

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Radwa Salem,
  • Mostafa M. H. Khalil,
  • Ali O. Turky,
  • Mohamed M. Rashad,
  • Ahmed Mourtada Elseman

摘要

Scheelite-type alkaline-earth tungstates (AWO4) are multifunctional materials, but controlling their properties through defect engineering remains a challenge. This study presents a facile, surfactant-free co-precipitation synthesis of strontium tungstate (SrxWO4) nanoparticles with precise control over Sr2⁺ doping ratio (x = 0.1, 0.3, 0.5, 1.0). Comprehensive characterization reveals that Sr2⁺ incorporation induces a phase transformation to a tetragonal scheelite SrWO4 structure. Crucially, the crystallinity and hierarchical microsphere morphology are strongly dependent on Sr content, with intermediate concentrations leading to smaller, defect-rich crystallites. The optical band gap was tuned between 3.83 and 3.86 eV, with the narrowing and widening trends correlated to defect states and the Burstein-Moss effect, respectively. Photoluminescence spectroscopy exhibited broad, multicolor emission, directly confirming the presence of oxygen vacancies and defect states. Crucially, room-temperature ferromagnetism was observed, a significant deviation from the diamagnetic nature of pristine WO₃. The saturation magnetization and coercivity showed a non-monotonic relationship with Sr content, which is interpreted as a defect-mediated phenomenon driven primarily by oxygen vacancies. The synergistic combination of tunable bandgap, defect-rich luminescence, and emergent ferromagnetism positions these SrxWO4 nanoparticles as highly promising candidates for advanced magneto-optical and spintronic devices.