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<p>The rapid development of technologies such as the 5G wireless communication system is entering a new era, facilitating high speed information access. However, this progress also brings challenges due to increased electromagnetic pollution. Consequently, the search for new materials with enhanced electromagnetic wave (EMW) absorption capabilities has become a significant area of research to protect human health and ensure the safe operation of devices. In this study, La<sub>2-<i>x</i></sub>(Ce<sub>0.5</sub>Sr<sub>0.5</sub>)<sub><i>x</i></sub>NiO<sub>4</sub> (<i>x</i> = 0.5, 1, 1.5, 2) samples were prepared, and their EMW absorption properties were investigated. Phase analysis revealed the formation of secondary phases, which increased heterogeneity and, in turn, enhanced magnetic anisotropy and dipole-dipole interactions, leading to improved magnetic and dielectric properties. Electron paramagnetic resonance spectroscopy revealed the presence of isolated antiferromagnetic spin clusters and change in both dipole-dipole and exchange interactions with an increase in <i>x</i>. In general, the particle size increased with higher doping concentrations, significantly affecting the dielectric and magnetic properties. The sample with <i>x</i> = 2 exhibited excellent EMW absorption characteristics, with a broad effective bandwidth of 4.2&#xa0;GHz and a minimum reflection loss of -30.2 dB. These results were attributed to moderate conductivity and the synergistic effect of dielectric and magnetic contributions, leading to better impedance matching and reduced surface reflections. Overall, these findings suggest that the sample with <i>x</i> = 2 is suitable as a filler for high-performance electromagnetic shielding applications.</p>

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Synergistic contributions to enhanced X-band absorption in La2-x(Sr0.5Ce0.5)xNiO4

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Akbar Khan,
  • Raz Muhammad,
  • M. Arshad Farhan,
  • Hafiz Zahid Shafi,
  • Danadan Han

摘要

The rapid development of technologies such as the 5G wireless communication system is entering a new era, facilitating high speed information access. However, this progress also brings challenges due to increased electromagnetic pollution. Consequently, the search for new materials with enhanced electromagnetic wave (EMW) absorption capabilities has become a significant area of research to protect human health and ensure the safe operation of devices. In this study, La2-x(Ce0.5Sr0.5)xNiO4 (x = 0.5, 1, 1.5, 2) samples were prepared, and their EMW absorption properties were investigated. Phase analysis revealed the formation of secondary phases, which increased heterogeneity and, in turn, enhanced magnetic anisotropy and dipole-dipole interactions, leading to improved magnetic and dielectric properties. Electron paramagnetic resonance spectroscopy revealed the presence of isolated antiferromagnetic spin clusters and change in both dipole-dipole and exchange interactions with an increase in x. In general, the particle size increased with higher doping concentrations, significantly affecting the dielectric and magnetic properties. The sample with x = 2 exhibited excellent EMW absorption characteristics, with a broad effective bandwidth of 4.2 GHz and a minimum reflection loss of -30.2 dB. These results were attributed to moderate conductivity and the synergistic effect of dielectric and magnetic contributions, leading to better impedance matching and reduced surface reflections. Overall, these findings suggest that the sample with x = 2 is suitable as a filler for high-performance electromagnetic shielding applications.