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<p>Electronic devices, especially those with sensitive components and communication systems, are highly susceptible to electromagnetic interference (EMI). As a result, there is an increasing demand for materials capable of efficiently attenuating or shielding against microwave radiation. In this work, we have successfully demonstrated that co-doping of Sr and Co in the La<sub>2</sub>NiO<sub>4</sub> with electron-rich Cobalt atoms in smaller concentrations, balancing the electrical neutrality. Here, we present an improved electromagnetic wave (EMW) absorption in La<sub>1.875</sub>Sr<sub>0.125</sub>Ni<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>4±<i>δ</i></sub> (<i>x</i> = 0.05, 0.1, 0.15, 0.20). A phase transition from tetragonal to orthorhombic was observed with an increase in <i>x</i>, which is due to non-stochiometric oxygen content, exhibiting long-range charge and spin ordering with antiferromagnetic arrangement. Electron paramagnetic resonance spectroscopy results showed that oxygen vacancies decreased with an increase in <i>x</i> which influenced the dielectric and magnetic properties, thereby enhancing EMW absorption. All the samples exhibited antiferromagnetic-like behavior. The sample with <i>x</i> = 0.1 showed ~ 97% of EMW absorption in the X-band, indicating potential for EMI shielding applications.</p>

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Structure, oxygen vacancy regulation and electromagnetic wave absorption of cobalt-doped La1.875Sr0.125NiO4±δ

  • 期刊论文

  • 发表日期：

    2025年4月22日

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

摘要

Electronic devices, especially those with sensitive components and communication systems, are highly susceptible to electromagnetic interference (EMI). As a result, there is an increasing demand for materials capable of efficiently attenuating or shielding against microwave radiation. In this work, we have successfully demonstrated that co-doping of Sr and Co in the La2NiO4 with electron-rich Cobalt atoms in smaller concentrations, balancing the electrical neutrality. Here, we present an improved electromagnetic wave (EMW) absorption in La1.875Sr0.125Ni1−xCoxO4±δ (x = 0.05, 0.1, 0.15, 0.20). A phase transition from tetragonal to orthorhombic was observed with an increase in x, which is due to non-stochiometric oxygen content, exhibiting long-range charge and spin ordering with antiferromagnetic arrangement. Electron paramagnetic resonance spectroscopy results showed that oxygen vacancies decreased with an increase in x which influenced the dielectric and magnetic properties, thereby enhancing EMW absorption. All the samples exhibited antiferromagnetic-like behavior. The sample with x = 0.1 showed ~ 97% of EMW absorption in the X-band, indicating potential for EMI shielding applications.