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<p>MnWO<sub>4</sub> nanomaterials were prepared via a conventional solid-state reaction route, with La<sup>3+</sup> ion substituted at the Mn site in varying concentrations. X-ray diffraction confirmed the formation of a well-crystallised monoclinic structure in the P2/c space group, while EDX analysis confirmed the elemental composition of La, Mn, W, and O. Raman and FTIR analyses revealed lattice distortion and defect formation induced by the incorporation of La<sup>3+</sup> ions. EPR measurements demonstrated that La<sup>3+</sup>-driven structural perturbations significantly influence spin relaxation processes and alter the resonance characteristics. Magnetic hysteresis (M-H) measurements at room temperature exhibited paramagnetic behavior, with a noticeable reduction in magnetization as the La concentration increased. Electrical transport studies showed semiconducting behavior with activation energies in the range of 0.303–0.363 eV. Furthermore, dielectric measurements indicated a decrease in the dielectric constant with La doping, while AC conductivity increased with frequency but declined with higher doping concentrations.</p>

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Effect of La3+ ion substitution on the structural, magnetic and electrical transport properties of MnWO4

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Mohammad Asif Adeeb,
  • Faizul Qamar,
  • Naseem Ahmad,
  • Surbhi Sharma,
  • Azizurrahaman Ansari,
  • Shakeel Khan

摘要

MnWO4 nanomaterials were prepared via a conventional solid-state reaction route, with La3+ ion substituted at the Mn site in varying concentrations. X-ray diffraction confirmed the formation of a well-crystallised monoclinic structure in the P2/c space group, while EDX analysis confirmed the elemental composition of La, Mn, W, and O. Raman and FTIR analyses revealed lattice distortion and defect formation induced by the incorporation of La3+ ions. EPR measurements demonstrated that La3+-driven structural perturbations significantly influence spin relaxation processes and alter the resonance characteristics. Magnetic hysteresis (M-H) measurements at room temperature exhibited paramagnetic behavior, with a noticeable reduction in magnetization as the La concentration increased. Electrical transport studies showed semiconducting behavior with activation energies in the range of 0.303–0.363 eV. Furthermore, dielectric measurements indicated a decrease in the dielectric constant with La doping, while AC conductivity increased with frequency but declined with higher doping concentrations.