The Effect of Hydrothermal Temperature and Sample Thickness on the Synthesis of BaFe₁₂O₁₉@MnO₂ Core-Shell Composites

Abstract:

Advances in radar technology today are experiencing rapid development based on the latest findings that complement each other. BaFe₁₂O₁₉ is a type M hexagonal ferrite material as the best candidate for absorber material applications. Manganese dioxide (MnO₂) is a transition metal that has a high dielectric loss and has the opportunity to increase the absorption of electromagnetic waves. The BaFe₁₂O₁₉@MnO₂ core-shell composite produces the combined characteristics of BaFe₁₂O₁₉ and MnO₂, which can improve performance as radar-absorbing material. The BaFe₁₂O₁₉@MnO₂ core-shell composite is synthesized in two stages: molten salt synthesis in manufacturing BaFe₁₂O₁₉ as a core and hydrothermal synthesis to grow MnO₂ nanoflowers as a shell. The research objective was to produce BaFe₁₂O₁₉@MnO₂ core-shell composite for radar absorbing applications in the x-band with absorption of ~99%. In molten salt synthesis, using two calcination operations at 1000 °C for two hours to create BaFe₁₂O₁₉ as a template, then combining BaFe₁₂O₁₉ template with Fe₂O₃ and BaCl₂.2H₂O for eight hours at 1100 °C prepared for MnO₂ pathways on the BaFe₁₂O₁₉ surface. Hydrothermal synthesis occurs by dissolving BaFe₁₂O₁₉ and KMnO₄ in deionized water with a mass ratio of BaFe₁₂O₁₉ to KMnO₄ is 1:1, followed by hydrothermal synthesis at a holding time of 12 hours with a temperature of 150 °C; 170 °C; 190 °C. Characterization of vector network analysis on a variation of sample thickness (1; 1.5; 2; 2.5; 3) mm were analyzed in the x-band frequency on 8-12 GHz. BaFe₁₂O₁₉@MnO₂ core-shell composite was hydrothermally produced at 170 °C with a particle size of 197.1 nm, a thickness of 2.5 mm, and a reflection loss of -20.31 dB at 8.7 GHz. The absorber material from the combined synthesis of molten salt and hydrothermal synthesis to make BaFe₁₂O₁₉@MnO₂ core-shell composite successfully produced microwave absorption up to 99.06%.

• Periodical: Materials Science Forum (Volume 1099)
• Pages: 129-138
• DOI: https://doi.org/10.4028/p-CX37ub
• Online since: October 2023
• Authors: Erlina Yustanti*, Alfian Noviyanto, Muhammad Ikramullah, Yogie Anes Marsillam, Maulana Randa
• Keywords: BaFe₁₂O₁₉@MnO₂, Core-Shell, Hydrothermal Synthesis, Radar Absorbing Material, Reflection Loss

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