Supplementary material from "C,N-codoped MoSi₂ ceramic with excellent heat resistance for microwaves absorption application"

Microwave absorption (MA) materials with high heat resistance have a wide range of applications in many fields. In this work, a C,N-codoped MoSi₂ ceramic was prepared via a facile solid phase reaction method and its MA properties was investigated. On the one hand, the results indicate that this ceramic possesses excellent heat resistance and the weight of the MoSi₂ is almost constant when the temperature is lower than 800°C. On the other hand, this ceramic shows good MA performance when the filler loading ratio increases to 30 vol%, the value of reflection loss (RL) could reach to −17.70 dB at 7.44 GHz with the thickness of 2.0 mm and the effective EM absorption bandwidth (RL below −10 dB) could reach to 1.88 GHz (9.28 GHz–11.16 GHz) with the thickness of 1.5 mm. Multi-polarization resonance loss is considered as the predominant attention mechanism on the MA performance of this MoSi₂ ceramic. This research provides a new idea for understanding resonance mechanism and greatly expands the application scope of MoSi₂ ceramic in MA area.