Abstract The search for high-efficiency and anti-corrosive microwave absorption (MA) materials plays a paramount role in improving the environmental adaptability and survivability of military targets in the harsh chemical conditions. However, it still faces huge challenges and lacks systematic research. Herein, a well-designed heterostructure composed of crystalline Ni3P core and amorphous Nix(POy)z shell was successfully fabricated through a facile annealing and thermal phosphating strategy. Electrochemical analysis demonstrated that the Ni3P@Nix(POy)z heterostructures delivered strong corrosion resistance in acid, alkaline, and salt environment owing to the presence of surface amorphous Nix(POy)z layer. Meanwhile, crystalline Ni3P/amorphous Nix(POy)z interface could trigger intensive interfacial polarization relaxation to strengthen microwave attenuation. Furthermore, abundant lattice defects, polar Ni-P bond, decreased band gap and intrinsic magnetism of Ni3P crystal endowed the Ni3P@Nix(POy)z heterostructures strong reflection loss (−43.1 dB), moderate absorption bandwidth (3.0 GHz) and ultra-thin thickness (1.3 mm). This work may provide an insight into the evaluation and development of corrosion-resistant microwave absorbents.

中文翻译：

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结晶非晶 Ni3P@Nix(POy)z 核壳异质结构作为耐腐蚀高效微波吸收剂

摘要 寻找高效、抗腐蚀的微波吸收（MA）材料对于提高军事目标在恶劣化学条件下的环境适应性和生存能力起着至关重要的作用。然而，它仍然面临着巨大的挑战，缺乏系统的研究。在此，通过简单的退火和热磷化策略成功地制造了由结晶 Ni3P 核和非晶 Nix(POy)z 壳组成的精心设计的异质结构。电化学分析表明，Ni3P@Nix(POy)z 异质结构由于表面无定形 Nix(POy)z 层的存在，在酸、碱和盐环境中具有很强的耐腐蚀性。同时，结晶 Ni3P/非晶 Nix(POy)z 界面可以触发强烈的界面极化弛豫以加强微波衰减。此外，丰富的晶格缺陷、极性 Ni-P 键、减小的带隙和 Ni3P 晶体的固有磁性赋予 Ni3P@Nix(POy)z 异质结构强反射损耗 (-43.1 dB)、中等吸收带宽 (3.0 GHz) 和超薄的厚度（1.3 毫米）。这项工作可能有助于深入了解耐腐蚀微波吸收剂的评估和开发。