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<p>We hereby report the hitherto unexplored optical properties of the Fe<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> (FMO) pyrochlore compound synthesized by the solid-state reaction route. The compound parades a monoclinic structure when confirmed by the X-ray diffraction patterns. The optical energy band gap of the material was calculated from the reflectance spectrum and was found to be 1.83&#xa0;eV. This compound showed higher reflectance in the UV range in comparison to that in the visible region. This makes this compound an effective candidate for blocking the harmful UV portion of the electromagnetic spectrum, which is hazardous to human health. Analysis of the extinction coefficient (<i>k</i>), skin depth (<i>δ</i>), and refractive index (<i>n</i>) over 200–800&#xa0;nm reveals that FMO displays strong optical activity in the UV region while showing weaker interaction with visible light. These characteristics underscore its potential for UV-blocking applications and its applicability in optical and photocatalytic systems. In the study, the real and imaginary components of the dielectric constant, as well as the loss factor, were estimated and discussed. The photocatalytic performance was evaluated by monitoring the degradation of rhodamine B (RhB) in aqueous solution using FMO under visible-light irradiation, where the material achieved an 80.35% degradation efficiency under sunlight.</p>

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Optical properties of Fe2Mn2O7 pyrochlore ceramic and its photocatalytic performance in rhodamine B dye degradation applications

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Kuldeep Singh,
  • Manjeet Rani,
  • Mahesh Kumar Yadav,
  • Neeraj Panwar

摘要

We hereby report the hitherto unexplored optical properties of the Fe2Mn2O7 (FMO) pyrochlore compound synthesized by the solid-state reaction route. The compound parades a monoclinic structure when confirmed by the X-ray diffraction patterns. The optical energy band gap of the material was calculated from the reflectance spectrum and was found to be 1.83 eV. This compound showed higher reflectance in the UV range in comparison to that in the visible region. This makes this compound an effective candidate for blocking the harmful UV portion of the electromagnetic spectrum, which is hazardous to human health. Analysis of the extinction coefficient (k), skin depth (δ), and refractive index (n) over 200–800 nm reveals that FMO displays strong optical activity in the UV region while showing weaker interaction with visible light. These characteristics underscore its potential for UV-blocking applications and its applicability in optical and photocatalytic systems. In the study, the real and imaginary components of the dielectric constant, as well as the loss factor, were estimated and discussed. The photocatalytic performance was evaluated by monitoring the degradation of rhodamine B (RhB) in aqueous solution using FMO under visible-light irradiation, where the material achieved an 80.35% degradation efficiency under sunlight.