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<p>The current research focuses on the structural, optical, electrical, and magnetic properties of nano-crystalline La<sub>2</sub>MMnO<sub>6</sub> (M = Ni, Cu &amp; Zn) double perovskites synthesized via Sol–Gel Pechini method. X-ray diffraction (XRD) confirmed the successful synthesis of single-phase double perovskites with precise crystallinity. Rietveld refinement revealed the presence of disordered phases (rhombohedral, <i>R3c</i> and orthorhombic, <i>Pbnm</i>) in addition to the ordered monoclinic phase, <i>P2</i><sub><i>1</i></sub><i>/n</i>, in the prepared compositions. This analysis provided detailed 3D structural data, including lattice parameters and bond lengths, confirming the homogeneity of the synthesized materials. XPS confirmed the existence of transition metal cations with different oxidation states. UV–Vis-NIR reflectance spectroscopy indicated the semiconducting nature of the developed compositions, with optical bandgap energies ~ 1&#xa0;eV. Among the samples, LNMO is found to be the most conducting sample, with a room temperature conductivity of ~ 2.69<b> × </b>10<sup>–2</sup> S/m. In contrast, LZMO exhibited the highest activation energy during DC conductivity measurements and demonstrated temperature-dependent conductivity behavior, which can be attributed to the varying oxidation states of elements at the M/M′-site in the perovskite structure, which follows the Arrhenius equation. Magnetic measurements indicated that LCMO &amp; LZMO have ferrimagnetic character, while LNMO showed ferromagnetic properties, with the highest value of saturation magnetization (~ 47.42&#xa0;emu/g). The findings of this study suggest that the synthesized double perovskites possess unique structural, optical, electrical, and magnetic properties, making them suitable for advanced energy storage and spintronic applications.</p>

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Synthesis and characterization of structural, optical and magnetic properties of nano-crystalline La2MMnO6 (M = Ni, Cu & Zn) double perovskites

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Reena Sharma,
  • Neelam Hooda,
  • Parth Singh Grewal,
  • Ashima Hooda,
  • Satish Khasa

摘要

The current research focuses on the structural, optical, electrical, and magnetic properties of nano-crystalline La2MMnO6 (M = Ni, Cu & Zn) double perovskites synthesized via Sol–Gel Pechini method. X-ray diffraction (XRD) confirmed the successful synthesis of single-phase double perovskites with precise crystallinity. Rietveld refinement revealed the presence of disordered phases (rhombohedral, R3c and orthorhombic, Pbnm) in addition to the ordered monoclinic phase, P21/n, in the prepared compositions. This analysis provided detailed 3D structural data, including lattice parameters and bond lengths, confirming the homogeneity of the synthesized materials. XPS confirmed the existence of transition metal cations with different oxidation states. UV–Vis-NIR reflectance spectroscopy indicated the semiconducting nature of the developed compositions, with optical bandgap energies ~ 1 eV. Among the samples, LNMO is found to be the most conducting sample, with a room temperature conductivity of ~ 2.69 × 10–2 S/m. In contrast, LZMO exhibited the highest activation energy during DC conductivity measurements and demonstrated temperature-dependent conductivity behavior, which can be attributed to the varying oxidation states of elements at the M/M′-site in the perovskite structure, which follows the Arrhenius equation. Magnetic measurements indicated that LCMO & LZMO have ferrimagnetic character, while LNMO showed ferromagnetic properties, with the highest value of saturation magnetization (~ 47.42 emu/g). The findings of this study suggest that the synthesized double perovskites possess unique structural, optical, electrical, and magnetic properties, making them suitable for advanced energy storage and spintronic applications.