XRD patterns of (Hf(1-X)/4Zr(1-X)/4Nb(1-X)/4Ta(1-X)/4CoX)C (X=0.14, 0.18, and 0.20) ceramic; TEM, HRTEM, EDS maps ; 2D and 3D maps of reflection loss values over frequency and thickness of (Hf0.215Zr0.215Nb0.215Ta0.215Co0.140)C; Electromagnetic wave absor (IMAGE)

Tsinghua University Press

XRD patterns of (Hf(1-X)/4Zr(1-X)/4Nb(1-X)/4Ta(1-X)/4CoX)C (X=0.14, 0.18, and 0.20) ceramic; TEM, HRTEM, EDS maps ; 2D and 3D maps of reflection loss values over frequency and thickness of (Hf0.215Zr0.215Nb0.215Ta0.215Co0.140)C; Electromagnetic wave absor

Caption

 (Hf(1-x)/4Zr(1-x)/4Nb(1-x)/4Ta(1-x)/4Cox)C (x=0.14, 0.18, and 0.20) ceramics were successfully synthesized with a single-phase high-entropy carbide exhibiting a rock salt structure under conditions ≥1800oC. The dielectric property tests show that, with increasing cobalt content, the complex permittivity and complex permeability of (Hf(1-x)/4Zr(1-x)/4Nb(1-x)/4Ta(1-x)/4Cox)C (x=0.14, 0.18, and 0.20) ceramics gradually decreased. The (Hf0.215Zr0.215Nb0.215Ta0.215Co0.140)C high-entropy ceramic exhibits the highest dielectric constant and permeability along with moderate conductivity, achieving an optimal balance between polarization relaxation, conduction loss, and magnetic loss. Therefore, among the studied materials, this ceramic exhibited the best microwave absorption performance, with an RLmin of -37.95 dB at a thickness of 3.10 mm.

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Journal of Advanced Ceramics, Tsinghua University Press

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