Ambient-Condition Synthesis of Cr2AlB2 Phase via Molten Salt Shielding for High-Performance Electromagnetic Wave Absorption

• • High-purity Cr2AlB2 was synthesized in air via molten salt shielded synthesis (MS3), eliminating the need for inert gas protection and reducing synthesis temperature, thereby cutting production costs significantly. • • The MS3-derived Cr2AlB2 achieves a minimum reflection loss (RLmin) of -42.10 dB at 12.6 GHz, indicating that over 99.99% of incident EMW energy is absorbed, which is critical for stealth and EMI shielding applications. • • A maximum effective absorption bandwidth (EABmax) of 3.44 GHz is attained at a thickness of 1.9 mm, covering a substantial portion of the X-band (8-12 GHz) and Ku-band (12-18 GHz), essential for radar and communication frequency management. • • The MS3 method enables ambient-condition synthesis, overcoming the oxidation challenge that previously necessitated costly inert gas setups, thus offering a scalable and economically viable pathway for industrial production of Cr2AlB2-based absorbers.