Abstract
Advancements in electronics and digitization have led to concerns about electromagnetic interference (EMI), necessitating effective EMI shielding measures. This study investigates the electromagnetic wave absorption properties of Lan+1NinO3n+1 (n = 1, 2, 3) Ruddlesden-popper (RP) phases. While a single phase, La2NiO4, was obtained for n = 1, mixed phases of La3N2O7-δ/La4Ni3O10-δ were observed for n = 2 and 3. Electron paramagnetic resonance spectroscopy revealed superparamagnetic behavior for La2NiO4 and multi-resonance peaks for La3Ni2O7-δ, suggesting increased surface defects. La3Ni2O7-δ exhibited enhanced absorption properties, with a minimum reflection loss of −19.4 dB and a broader (less than −10 dB) bandwidth covering 4.2 GHz (X-band) at a thickness of 1.4 mm, attributed to optimal conductivity, magnetic resonance, eddy current losses, and synergistic dielectric loss. The sample with n = 2 demonstrates potential for EMI absorption and electrostatic discharge (ESD) applications.
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