This work aims to achieve the excellent microwave absorption in layered dielectric nickelate compounds. The phase, microstructure, electromagnetic properties, and microwave absorption of the Sr-modified La_2–xSr_xNiO_4±δ (x = 0, 0.3, 0.5, 0.75) nickelates were investigated, determining and analyzing the role of Sr doping level. All compounds reveal the single tetragonal phase identified as the I4/mmm space group, and the lattice parameters correlate with the doping content, evidenced by Rietveld refinement. By introducing strontium, the pronouncedly increased electronic conductivity contributes to the high dielectric loss, which gives rise to a superior attenuation ability and absorbing bandwidth. A minimum reflection loss of -21.07 dB was found in La_2–xSr_xNiO_4±δ (x = 0.75) at a thickness of 1.9 mm, covering the effective bandwidth of 2.9 GHz. This enhanced microwave absorbing performance in nickelate shows promise in the radar absorbing field.

这项工作旨在在层状电介质镍酸盐化合物中实现出色的微波吸收。Sr修饰的La _2–的相，微结构，电磁特性和微波吸收_Xr_XNiO _4±δ（X分别对0，0.3，0.5，0.75）的镍酸盐进行了研究，确定并分析了Sr掺杂水平的作用。所有化合物均显示出鉴定为一世4 /嗯Rietveld精炼证明，空间群和晶格参数与掺杂含量相关。通过引入锶，电子电导率的显着提高导致了高介电损耗，从而带来了出色的衰减能力和吸收带宽。在La _2–中发现最小反射损耗为-21.07 dB_Xr_XNiO _4±δ（X= 0.75），厚度为1.9 mm，覆盖了2.9 GHz的有效带宽。镍酸盐中增强的微波吸收性能在雷达吸收领域显示出了希望。