Broadband electromagnetic wave attenuation in high-entropy La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3: Engineering bond properties via configurational entropy

Owing to the intrinsic dielectric-magnetic coupling loss mechanism, perovskite-type lanthanide-transition metal oxide (LaTMO 3 ) is considered as a promising candidate for electromagnetic wave absorbing material, but unmodified LaTMO 3 suffers from limited polarization processes and weak super-exchange magnetic response. Herein, we manipulate the TM-O bond properties by regulating the configuration entropy of transition metal sites to address such issues within single-phase LaTMO 3 . Elaborate structural characterization and P-V-L bond theory demonstrate quantitatively the optimization of electromagnetic wave absorption performance mainly stems from the synergistic improvement in TM-O bond distortion degree and covalency, as well as the formation of diverse super-exchange pathways. Consequently, the high entropy La(Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 )O 3 exhibits a minimum reflection loss of −50.68 dB, an effective absorption bandwidth covering entire Ku band of 7.6 GHz. The radar cross section of the structure with La(Cr 0.2 Mn 0.2 Fa 0.2 Co 0.2 Ni 0.2 )O 3 coating are less than −10 dBm 2 within the incident angles -60-60°. This study contributes to a deeper understanding of design and preparation of efficient broadband electromagnetic wave absorbing materials.