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A novel model with low–high–low permittivity hierarchical architecture was designed for high-temperature electromagnetic wave (EM) absorption. Si3N4–SiC/SiO2 composite ceramic was fabricated to verify this model. Dielectric properties of Si3N4–SiC/SiO2 in X-band from 25 to 600 °C were investigated. Due to the special designed structure, the effective permittivity of Si3N4–SiC/SiO2 increases slightly...
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