YCoO_(3) has unique advantages in functional applications owing to its exceptional lattice stability,valence adaptability,and environmental resistance;however,its potential for microwave absorption remains largely une...YCoO_(3) has unique advantages in functional applications owing to its exceptional lattice stability,valence adaptability,and environmental resistance;however,its potential for microwave absorption remains largely unexplored.In this study,Y_(0.9)Sr_(0.1)Co_(1-x)Fe_(x)O_(3)(x=0–0.2)perovskite absorbers were synthesized via a sol–gel method,which demonstrated superior microwave absorption performance.Oxygen vacancy engineering facilitates Co redox cycling,significantly enhancing oxygen ion mobility and conductivity loss.First-principles calculations revealed that Fe^(3+)doping not only intensifies crystal polarization but also improves magnetic properties,thereby synergistically optimizing dipole polarization and magnetic losses.Additionally,the nanoscale particle morphology enhances the interfacial polarization effects.The optimal composition(x=0.1)achieves an effective absorption bandwidth(EAB)of 5.71 GHz with a reflection loss(RL)of-47.18 dB at a thickness below 1.8 mm,demonstrating a significant enhancement over that of the undoped material.This work provides new insights into the design of ultrathin,high-performance absorbers while elucidating the fundamental loss mechanisms in perovskite-based systems.展开更多
基金Financial support from the National Natural Science Foundation of China(No.52273247)the Aeronautics Science Foundation of China(No.ASFC-20230018052001)。
文摘YCoO_(3) has unique advantages in functional applications owing to its exceptional lattice stability,valence adaptability,and environmental resistance;however,its potential for microwave absorption remains largely unexplored.In this study,Y_(0.9)Sr_(0.1)Co_(1-x)Fe_(x)O_(3)(x=0–0.2)perovskite absorbers were synthesized via a sol–gel method,which demonstrated superior microwave absorption performance.Oxygen vacancy engineering facilitates Co redox cycling,significantly enhancing oxygen ion mobility and conductivity loss.First-principles calculations revealed that Fe^(3+)doping not only intensifies crystal polarization but also improves magnetic properties,thereby synergistically optimizing dipole polarization and magnetic losses.Additionally,the nanoscale particle morphology enhances the interfacial polarization effects.The optimal composition(x=0.1)achieves an effective absorption bandwidth(EAB)of 5.71 GHz with a reflection loss(RL)of-47.18 dB at a thickness below 1.8 mm,demonstrating a significant enhancement over that of the undoped material.This work provides new insights into the design of ultrathin,high-performance absorbers while elucidating the fundamental loss mechanisms in perovskite-based systems.
