FADLI HANDOYO, . (2024) SINTESIS DAN KARAKTERISASI PELAT KOMPOSIT Fe3O4/SiO2 BERBASIS BAHAN LOKAL SEBAGAI PENYERAP GELOMBANG MIKRO. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
![[img]](http://repository.unj.ac.id/style/images/fileicons/text.png) |
Text
COVER.pdf Download (411kB) |
|
Text
BAB I.pdf Download (312kB) |
|
Text
BAB II.pdf Restricted to Repository staff only Download (795kB) | Request a copy |
|
Text
BAB III.pdf Restricted to Repository staff only Download (338kB) | Request a copy |
|
Text
BAB IV.pdf Restricted to Repository staff only Download (420kB) | Request a copy |
|
Text
BAB V.pdf Download (248kB) |
|
Text
DAFTAR PUSTAKA.pdf Download (308kB) |
|
Text
LAMPIRAN.pdf Restricted to Repository staff only Download (450kB) | Request a copy |
Abstract
Fe3O4/SiO2 merupakan kombinasi bahan yang digunakan untuk menyerap gelombang mikro. Fe3O4, umum ditemukan di pantai pantai Indonesia, memiliki sifat magnetik tinggi namun kurang efektif pada frekuensi tinggi. Penambahan SiO2 meningkatkan kapasitas penyerapan dan sifat listriknya. Sintesis Fe3O4/SiO2 dengan variasi SiO2 (0%, 5%, 10%, 15%, 20%, 25%) dalam pelat 2 mm telah dilakukan melalui metode mechanical milling dan dikarakterisasi dengan Optik, Permagraph, dan VNA. Hasil analisis Optik dengan mikroskop digital menunjukkan bahwa penambahan SiO2 hingga 10% meningkatkan homogenitas dan distribusi porositas, sementara lebih dari 10% menyebabkan sedikitnya porositas. Sifat magnetik menunjukkan penurunan magnetisasi saturasi dan remanensi akibat penambahan SiO2, baik sebelum maupun sesudah milling 10 jam. Nilai koersivitas yang kecil membuktikan material ini termasuk soft magnetic. Hasil VNA menunjukkan kinerja penyerapan optimal pelat komposit 2 mm dengan variasi SiO2 0%, 5%, dan 10%. Pada SiO2 0%, nilai TL minimum adalah -15.682 dB (Am + R 97.3%). Pada SiO2 5%, nilai TL minimum adalah -14.395 dB (Am + R 96.36%). Pada SiO2 10%, nilai TL minimum adalah -12.511 dB (Am + R 94.39%). ***** Fe3O4/SiO2 is a material combination used for microwave absorption. Fe3O4, commonly found on Indonesian beaches, has high magnetic properties but is less effective at high frequencies. The addition of SiO2 enhances absorption capacity and electrical properties. The synthesis of Fe3O4/SiO2 with varying SiO2 content (0%, 5%, 10%, 15%, 20%, 25%) in 2 mm plates was performed through mechanical milling and characterized using Optical, Permagraph, and VNA methods. Optical analysis with a digital microscope showed that the addition of SiO2 up to 10% improved homogeneity and pore distribution, while amounts greater than 10% resulted in fewer pores. Magnetic properties indicated a decrease in saturation magnetization and remanence due to SiO2 addition, both before and after 10 hours of milling. The small coercivity values confirm that this material is soft magnetic. VNA results showed optimal absorption performance for the 2 mm composite plates with SiO2 variations of 0%, 5%, and 10%. At 0% SiO2, the minimum TL value was -15.682 dB (Am + R 97.3%). At 5% SiO2, the minimum TL value was -14.395 dB (Am + R 96.36%). At 10% SiO2, the minimum TL value was -12.511 dB (Am + R 94.39%).
| Item Type: | Thesis (Sarjana) |
|---|---|
| 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 24757 not found. |
| Date Deposited: | 14 Aug 2024 00:56 |
| Last Modified: | 14 Aug 2024 00:56 |
| URI: | http://repository.unj.ac.id/id/eprint/49007 |
Actions (login required)
 |
View Item |
