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<p>In this study, Pr<sub>0.7</sub>Ba<sub>0.3</sub>MnO<sub>3</sub> (PBMO) and its composite were synthesized and thoroughly tested for microwave absorption performance in the X-band (8.2–12.4&#xa0;GHz). The compositions, P1 (PBMO), P2 (PBMO + 2wt% Fe<sub>2</sub>O<sub>3</sub>), and P3 (PBMO + 4 wt% Fe<sub>2</sub>O<sub>3</sub> + 0.5 wt% rGO), were prepared via a traditional solid-state approach followed by mechanical blending. X-ray diffraction confirmed the existence of an orthorhombic perovskite phase with space group Pbnm and no identifiable secondary peaks. Magnetic hysteresis study indicated prominent antiferromagnetic features, which are consistent with manganite perovskites’ inherent magnetic ordering. The attenuation constant (α) and C₀ parameter studies revealed a shift from eddy-current to resonance-dominated loss causes, particularly in the P3 composite. Improved dielectric and magnetic coupling resulted in better impedance matching and optimal energy attenuation. The P3 composite has a minimum reflection loss (R<sub>L</sub>min) of − 54.93&#xa0;dB at 11.14&#xa0;GHz and an effective absorption bandwidth (EAB) of 2.34&#xa0;GHz at a thickness of 1.4&#xa0;mm, extending&#xa0;partial absorption in the Ku-band region. Furthermore, all compositions showed shielding effectiveness (SE<sub>T</sub>) values greater than 20&#xa0;dB across the X-band, resulting in over 99% electromagnetic wave attenuation. The findings emphasize the efficacy of Fe<sub>2</sub>O<sub>3</sub>-rGO modified PBMO composites as efficient, lightweight, and broadband absorbers for next-generation electromagnetic interference (EMI) and stealth applications.</p>

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Enhanced microwave absorption in Fe2O3- rGO modified Pr0.7Ba0.3MnO3 perovskites through dual-loss synergy

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Shiffali Middha,
  • Indu Sharma,
  • Vishal Arora,
  • Nitin Tandon,
  • Satvir Singh,
  • Harmanjit Singh Dosanjh,
  • Shaminder Singh,
  • Chirag Garg,
  • Neeraj Bansal,
  • Pawandeep Kaur,
  • Jaspal Singh,
  • Amritpal Singh Nindrayog,
  • Anupinder Singh

摘要

In this study, Pr0.7Ba0.3MnO3 (PBMO) and its composite were synthesized and thoroughly tested for microwave absorption performance in the X-band (8.2–12.4 GHz). The compositions, P1 (PBMO), P2 (PBMO + 2wt% Fe2O3), and P3 (PBMO + 4 wt% Fe2O3 + 0.5 wt% rGO), were prepared via a traditional solid-state approach followed by mechanical blending. X-ray diffraction confirmed the existence of an orthorhombic perovskite phase with space group Pbnm and no identifiable secondary peaks. Magnetic hysteresis study indicated prominent antiferromagnetic features, which are consistent with manganite perovskites’ inherent magnetic ordering. The attenuation constant (α) and C₀ parameter studies revealed a shift from eddy-current to resonance-dominated loss causes, particularly in the P3 composite. Improved dielectric and magnetic coupling resulted in better impedance matching and optimal energy attenuation. The P3 composite has a minimum reflection loss (RLmin) of − 54.93 dB at 11.14 GHz and an effective absorption bandwidth (EAB) of 2.34 GHz at a thickness of 1.4 mm, extending partial absorption in the Ku-band region. Furthermore, all compositions showed shielding effectiveness (SET) values greater than 20 dB across the X-band, resulting in over 99% electromagnetic wave attenuation. The findings emphasize the efficacy of Fe2O3-rGO modified PBMO composites as efficient, lightweight, and broadband absorbers for next-generation electromagnetic interference (EMI) and stealth applications.