Defect engineering enables the efficient management of electromagnetic parameters and the enhancement of electromagnetic wave(EMW)absorption.In this study,(Fe_(1−x)Mn_(x))_(2)AlB_(2) transition metal boride(MAB)phases...Defect engineering enables the efficient management of electromagnetic parameters and the enhancement of electromagnetic wave(EMW)absorption.In this study,(Fe_(1−x)Mn_(x))_(2)AlB_(2) transition metal boride(MAB)phases with a layered structure were prepared via Joule heating-driven ultrafast synthesis,and their EMW absorption properties were investigated.The experimental results demonstrate that the incorporation of Mn atoms at the M site can effectively modulate the impedance matching and EMW absorption properties of the material through the introduction of defects and lattice distortions.Notably,(Fe_(0.3)Mn_(0.7))_(2)AlB_(2) exhibits a reflection loss as high as−47.8 dB at 12.24 GHz,with a maximum effective absorption bandwidth of 4.16 GHz(10.24-14.40 GHz)at an ultrasmall thickness of 1.5 mm.This study provides a promising avenue for the development of excellent microwave-absorbing materials,which are essential for meeting the evolving requirements of advanced electronics.Additionally,this work offers a paradigm for enhancing other properties of MAB phases through defect engineering.展开更多
文摘Defect engineering enables the efficient management of electromagnetic parameters and the enhancement of electromagnetic wave(EMW)absorption.In this study,(Fe_(1−x)Mn_(x))_(2)AlB_(2) transition metal boride(MAB)phases with a layered structure were prepared via Joule heating-driven ultrafast synthesis,and their EMW absorption properties were investigated.The experimental results demonstrate that the incorporation of Mn atoms at the M site can effectively modulate the impedance matching and EMW absorption properties of the material through the introduction of defects and lattice distortions.Notably,(Fe_(0.3)Mn_(0.7))_(2)AlB_(2) exhibits a reflection loss as high as−47.8 dB at 12.24 GHz,with a maximum effective absorption bandwidth of 4.16 GHz(10.24-14.40 GHz)at an ultrasmall thickness of 1.5 mm.This study provides a promising avenue for the development of excellent microwave-absorbing materials,which are essential for meeting the evolving requirements of advanced electronics.Additionally,this work offers a paradigm for enhancing other properties of MAB phases through defect engineering.
