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<p>Double perovskite materials incorporating rare earth elements, such as La₂BB′O₆ (here B represents Ni and B′ denotes Mn), have been extensively investigated. In this study, La₂NiMnO₆ (LNMO) was synthesized by employing solid-state reaction approach. X-ray diffraction (XRD) analysis confirmed development of a monoclinic crystal structure with P2₁/n space group. Diffuse reflectance spectroscopy demonstrated strong reflectance and minimal absorbance in visible and near-infrared regions, indicating optical transparency. Direct optical band gap, estimated to be 2.96&#xa0;eV using the Kubelka–Munk-transformed Tauc plot, highlights its potential for UV-filtering and optoelectronic applications. FTIR spectra exhibited pronounced antisymmetric stretching at ~ 556.78&#xa0;cm<sup>−1</sup> and bending modes around 913.24&#xa0;cm<sup>−1</sup>, affirming the presence of Ni–O and Mn–O bonds within (Ni/Mn) O₆ octahedral network. Ferromagnetic transitions observed near 150&#xa0;K and 280&#xa0;K were attributed to B-site cation ordering. Dielectric studies over the 20&#xa0;kHz–2&#xa0;MHz range, modelled by the Maxwell–Wagner and Koops theories, revealed Debye relaxation behaviour and characteristic impedance trends.</p> Graphical Abstract <p></p>

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Structural, Optical, and Dielectric Properties of Double Perovskite La2NiMnO6

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Dhyani Parikh,
  • Vedvyas Dwivedi,
  • C. R. Vaja,
  • Aditya Vora,
  • Nisha Thankachen

摘要

Double perovskite materials incorporating rare earth elements, such as La₂BB′O₆ (here B represents Ni and B′ denotes Mn), have been extensively investigated. In this study, La₂NiMnO₆ (LNMO) was synthesized by employing solid-state reaction approach. X-ray diffraction (XRD) analysis confirmed development of a monoclinic crystal structure with P2₁/n space group. Diffuse reflectance spectroscopy demonstrated strong reflectance and minimal absorbance in visible and near-infrared regions, indicating optical transparency. Direct optical band gap, estimated to be 2.96 eV using the Kubelka–Munk-transformed Tauc plot, highlights its potential for UV-filtering and optoelectronic applications. FTIR spectra exhibited pronounced antisymmetric stretching at ~ 556.78 cm−1 and bending modes around 913.24 cm−1, affirming the presence of Ni–O and Mn–O bonds within (Ni/Mn) O₆ octahedral network. Ferromagnetic transitions observed near 150 K and 280 K were attributed to B-site cation ordering. Dielectric studies over the 20 kHz–2 MHz range, modelled by the Maxwell–Wagner and Koops theories, revealed Debye relaxation behaviour and characteristic impedance trends.

Graphical Abstract