Studies on dielectric and magnetic properties of barium hexaferrite and bio-waste derived activated carbon composites for X-band microwave absorption

Goel, Shivanshu; Garg, Avesh; Baskey, Himangshu Bhusan; Pandey, Mritunjay Kumar; Tyagi, Sachin

doi:10.1016/j.jallcom.2021.160028

Cited by 32 publications

(9 citation statements)

References 73 publications

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“…The decrease in M S might result from substituting magnetic ferrite with nonmagnetic Ti 3 C 2 T x ‐MXene, reducing the net magnetic moment. [ 33 ] In this case, the reduction in M S suggests that the magnetic moments within the material aligned less efficiently in the presence of Ti 3 C 2 T x ‐MXene. This could be due to the disruption caused by introducing Ti 3 C 2 T x ‐MXene particles, affecting the overall alignment of the magnetic domains.…”

Section: Resultsmentioning

confidence: 98%

Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Mohammed

Mohammed²,

Godara

et al. 2023

Physica Status Solidi (b)

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Ba1.8Sr0.2Co2Fe11.9Pr0.1O22/Ti3C2Tx‐MXene composites are synthesized with the unique combination of magnetic and conducting components that enhance electromagnetic wave absorption. Ba1.8Sr0.2Co2Fe11.9Pr0.1O22, Ti3C2Tx‐MXene and their composites in a weight ratio of 100:0 (YM1), 75:25 (YM2) and 50:50 (YM3) are synthesized by sol–gel autocombustion, etching process, and mechanical blending, respectively. From the morphology of the composites, Ba1.8Sr0.2Co2Fe11.9Pr0.1O22 particles are confirmed to be well‐integrated with the Ti3C2Tx‐MXene, indicating that the Ba1.8Sr0.2Co2Fe11.9Pr0.1O22 particles are evenly distributed in the Ti3C2Tx‐MXene, leading to homogeneous composites. M–H loop exhibits a saturation magnetization and coercivity of 23.01 emu g−1, 14.87 emu g−1, 12.45 emu g−1, and 87.44 Oe, 94.06 Oe, 102.97 Oe for YM1, YM2, and YM3, respectively. The reflection losses for YM1, YM2, and YM3 are −8.88, −11.64, and −21.39 dB, respectively. The double‐resonance peaks contribute to two magnetic loss peaks in YM3 within a broad frequency range. The higher attenuation constant is observed for YM3 corresponding to a stronger electromagnetic absorption. The improved electromagnetic properties of the composites can be attributed to the synergistic effect between the Ba1.8Sr0.2Co2Fe11.9Pr0.1O22 and Ti3C2Tx‐MXene, which enhances the impedance matching and increases the absorption of electromagnetic waves. These improved electromagnetic properties are important in applications such as electronic devices and communication systems.

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Section: Resultsmentioning

confidence: 98%

Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Mohammed

Mohammed²,

Godara

et al. 2023

Physica Status Solidi (b)

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“…The electromagnetic absorption performance is significantly affected by two critical factors: attenuation characteristics (α) and impedance matching ( Z ). − A higher α value indicates a stronger electromagnetic attenuation capability. The α can be calculated using the following eq α = 2 π f c ( μ ″ ε ″ − μ ′ ε ′ ) + false( μ ″ ε ″ − μ ′ ε ′ false) 2 + false( μ ′ ε ″ + μ ″ ε ′ false) 2 …”

Section: Resultsmentioning

confidence: 99%

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Chen,

Chen

et al. 2023

Inorg. Chem.

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Combining magnetic and dielectric materials to form a composite can significantly improve its impedance matching and electromagnetic wave absorption performance. Furthermore, composite materials with a core−shell structure hold promise in meeting the demand for lightweight and highly electromagneticabsorbing properties. In this study, uniform hexagonal flake barium ferrite (BaFe 12 O 19 ) was prepared using the hydrothermal method. Subsequently, BaFe 12 O 19 @PVDF composites were synthesized by the sol−gel method. By adjusting the mass ratio of BaFe 12 O 19 and PVDF, the shell size of the BaFe 12 O 19 @PVDF composite material was controlled, and its electromagnetic absorption performance was enhanced. The shell thickness of BaFe 12 O 19 @PVDF is 19.64 nm when the BaFe 12 O 19 : PVDF mass ratio is 1:1.0, and the optimal impedance matching is obtained at 13.4 GHz. Meanwhile, at a thickness of 1.5 mm, the minimum reflection loss (RL min ) reached −58.04 dB, and an effective absorption bandwidth (EAB) (RL ≤ −10 dB) of 5.53 GHz was achieved within the frequency range of 11.65 to 15.63 GHz and from 16.36 to 17.91 GHz. Besides, the composites with a matching thickness of 3.5 mm show a maximum EAB of 15.90 GHz when the mass ratio of BaFe 12 O 19 to PVDF is 1:1.2. Within the frequency range of 2−18 GHz, the coverage of reflection loss less than −10 dB is 99.38%, almost achieving full coverage. These results demonstrate that BaFe 12 O 19 @PVDF composites exhibit excellent electromagnetic-absorbing performances, making them an excellent candidate for electromagnetic wave absorption in 5G communications.

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“…Based on the theory of electromagnetic field, the real parts (ε and µ ) of complex permittivity and permeability are related to the electromagnetic energy storage and the imaginary parts (ε and µ ) represent the energy dissipation of the materials. In generally, the dielectric and magnetic loss tangent (tan δ e = ε / ε , tan δ m = µ / µ ) described the dissipation mechanism of the absorber [32]. Figure 6a…”

Section: Resultsmentioning

confidence: 99%

Microwave-Boosted One-Step Synthesis of Nanocrystal N-Doped 2D Carbon/Ni Composite with High Electromagnetic Absorption Performance

et al. 2021

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As the problems of electromagnetic pollution and interference are becoming increasingly serious, the development of electromagnetic absorption materials with a high absorption capacity and broad absorption bandwidth are stringently needed. In this work, an N-doped 2D carbon/Ni complex is synthesized through direct microwave irradiation on a mixed solution of nickel nitrate, urea, and agarose under N2. The electromagnetic absorption performance can be tuned by controlling the Ni content. Specifically, minimum reflection loss values (RLmin) of −65.5 dB at 15.8 GHz with an effective absorption bandwidth (EAB) of 4.2 GHz at a sample thickness of 1.47 mm, and −55.4 dB at 11.8 GHz with an EAB of 3 GHz at a sample thickness of 1.92 mm can be obtained. The outstanding performance of electromagnetic absorption is attributed to the multiple polarization relaxation processes and the synergistic effect between 2D carbon sheets and Ni particles.

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Studies on dielectric and magnetic properties of barium hexaferrite and bio-waste derived activated carbon composites for X-band microwave absorption

Cited by 32 publications

References 73 publications

Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Microwave-Boosted One-Step Synthesis of Nanocrystal N-Doped 2D Carbon/Ni Composite with High Electromagnetic Absorption Performance

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Studies on dielectric and magnetic properties of barium hexaferrite and bio-waste derived activated carbon composites for X-band microwave absorption

Cited by 32 publications

References 73 publications

Synthesis, Characterization, and Electromagnetic Properties of Ba1.8Sr0.2Co2Fe11.9Pr0.1O22/Ti3C2Tx‐MXene Composites

Synthesis, Characterization, and Electromagnetic Properties of Ba1.8Sr0.2Co2Fe11.9Pr0.1O22/Ti3C2Tx‐MXene Composites

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe12O19@PVDF Composites

Microwave-Boosted One-Step Synthesis of Nanocrystal N-Doped 2D Carbon/Ni Composite with High Electromagnetic Absorption Performance

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Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Synthesis, Characterization, and Electromagnetic Properties of Ba_1.8Sr_0.2Co₂Fe_11.9Pr_0.1O₂₂/Ti₃C₂T_x‐MXene Composites

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites