▎ 摘　　要

SiBCN-reduced graphene oxide (SiBCN-rGO) ceramic composites with different rGO content derived from a single-source precursor were successful synthesized by polymer derived ceramics routes to tune their dielectric properties and electromagnetic wave absorption capacity. SiBCN-rGO ceramic composites with 6 wt% GO annealed at 1300 degrees C possessed the best microwave absorption performance obtaining the minimum reflection coefficient (RCmin) of -62.71 dB at 10.72 GHz, and the thin thickness of 2.17 mm. Adjusting its thickness to 1.58 mm could obtain the maximum effective absorption bandwidth (RC < -10 dB) of 4.32 GHz. The microwave absorption mechanisms of the as-prepared SiBCN-rGO ceramic composites were mainly attributed to the conductive loss and polarization loss induced by the synergistic effects of amorphous SiBCN matrix, rGO and SiC nanocrystals. (C) 2021 Elsevier Ltd. All rights reserved.