ARIQ RIZKI PRADANA, . (2024) PENGARUH VARIASI PLAT KONDUKTIF (Fe, Al, Cu) TERHADAP MATERIAL PENYERAP Fe3O4 dan SiO2 PADA GELOMBANG MIKRO (7-13 GHz). Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Magnetit merupakan senyawa mineral yang ditemukan dalam bentuk mineral Fe3O4, salah satu contoh magnetit adalah pasir besi, Silika dioksida (SiO2) merupakan merupakan salah satu senyawa penting dalam kehidupan sehari-hari karena stabilitas termal yang tinggi, contohnya pasir pantai. Sintesis Fe3O4 dan SiO2 dengan variasi (0%, 5%, 10%, 15%, dan 20%) dalam plat konduktif (Fe, Al, Cu) yang di coating dengan cat epoksi dan menggunakan metode mechanical milling dikarakterisasi dengan Optik, Permagraph, dan VNA. Hasil analisis sturukur morfologi permukaan dengan mikroskop digital menunjukkan bahwa penambahan komposisi dan jumlah lapisan (layer) mempengaruhi struktur permukaan pada plat magnetik serta mengalami aglomerasi dibeberapa titik permukaan. Sifat magnetik menunjukkan penurunan pada magnetisasi remanansi (Mr) dan magnetisasi saturasi (Ms), sedangkan pada medan koersivitas (Hc) menunjukkan peningkatan. Nilai koersivitas yang kecil menunjukkan material termasuk soft magnetic. Hasil VNA menunjukkan plat magnetik (Fe, Al, Cu) paling efisien berada di plat Al dengan sudut 5o. Untuk plat Al variasi 0% TL sebesar 20.380 dB pada frekuensi 9.625 daya serap Am + R (%) sebesar 99.083%. Plat Al variasi 5% TL sebesar -19.454 dB pada frekuensi 7.261 GHz dan daya serap Am + R (%) sebesar 98.866%. Plat Al variasi 10% TL sebesar -25.671 pada frekuensi 7.308 GHz daya serap Am + R (%) sebesar 99.729%. Plat Al variasi 15% TL sebesar -22.561 pada frekuensi 7.261 GHz daya serap Am + R (%) sebesar 99.455%. Plat Al variasi 20% TL sebesar -11.321 dB pada frekuensi 7.255 GHz dengan daya serap Am + R (%) sebesar 92.623%. Kata Kunci: Plat magnetik (Fe, Al, Cu), mechanical milling, penyerap gelombang mikro, Transmission Loss (TL) ***** Magnetite is a mineral compound found in the form of Fe3O4 mineral, one example of magnetite is iron sand, Silica dioxide (SiO2) is one of the important compounds in everyday life because of its high thermal stability, for example beach sand. The synthesis of Fe3O4 and SiO2 with variations (0%, 5%, 10%, 15%, and 20%) in conductive plates (Fe, Al, Cu) coated with epoxy paint and using the mechanical milling method was characterized by Microscopy Optics, Permagraph, and VNA. The results of analyzing the surface morphological structure with a digital microscope show that the addition of composition and coating thickness affects the surface structure on the magnetic plate and experiences a buildup (agglomeration) at several surface points. Magnetic properties show a decrease in remanence magnetization (Mr) and saturation magnetization (Ms), while the coercivity field (Hc) shows an increase. The small coercivity value indicates the material is soft magnetic. VNA results show that the most efficient magnetic plate (Fe, Al, Cu) is on the Al plate with an angle of 5o. For the Al plate, the 0% TL variation is 20.380 dB at a frequency of 9.625, the absorption of Am + R (%) is 99.083%. The 5% TL variation Al plate is -19.454 dB at a frequency of 7.261 GHz and the Am + R absorption (%) is 98.866%. Al plate of 10% TL variation amounted to -25.671 at a frequency of 7.308 GHz and Am + R absorption (%) of 99.729%. Al plate 15% TL variation of -22.561 at a frequency of 7.261 GHz Am + R absorption (%) is 92.623%. Keywords : Magnetic plate (Fe, Al, Cu), mechanical milling, microwave absorber, Transmission Loss (TL)
Item Type: | Thesis (Sarjana) |
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Additional Information: | 1). Prof. Dr. Erfan Handoko, M.Si ; 2). Prof. Dr. Mangasi Alion Marpaung, M.Si |
Subjects: | Sains > Fisika |
Divisions: | FMIPA > S1 Fisika |
Depositing User: | Users 24851 not found. |
Date Deposited: | 13 Aug 2024 03:50 |
Last Modified: | 19 Aug 2024 01:00 |
URI: | http://repository.unj.ac.id/id/eprint/49880 |
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