SINTESIS MATERIAL NANOKOMPOSIT BaFe12O19/Fe3O4/SiO2 SEBAGAI BAHAN PENYERAP GELOMBANG MIKRO

ADAYILA MUDA MUTIARA, . (2024) SINTESIS MATERIAL NANOKOMPOSIT BaFe12O19/Fe3O4/SiO2 SEBAGAI BAHAN PENYERAP GELOMBANG MIKRO. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Barium heksaferit (BaFe12O19) merupakan material magnet permanen yang bersifat hard magnetic menjadikanya material yang mampu dimanfaatkan dalam berbagai apikasi teknologi maju. Telah dilakukan proses sintesis material nanokomposit BaFe12O19/Fe3O4/SiO2 sebagai aplikasi penyerap gelombang mikro dengan menggunakan metode mechanicall milling. Pada penelitian ini dikembangkan tentang sintesis BaFe12O19 yang dimodifikasi dengan penambahan unsur Fe3O4 dan SiO2 sebanyak 0%; 5%; 10% dan 15%, serta memvariasikan waktu milling selama 0 jam, 10 jam, 20 jam dan 50 jam. Mikroskop digital, Permagraph dan Vector Network Analyzer (VNA) digunakan untuk menganalisis morfologi permukaan, sifat magnetik, dan sifat penyerapan gelombang mikro. Hasil yang diperoleh setelah empat variasi milling untuk masing-masing sampel adalah. Waktu penghalusan mempengaruhi struktur permukaan seiring bertambahnya waktu milling pada material nanokomposit BaFe12O19/Fe3O4/SiO2. Sifat kemagnetan material nanokomposit BaFe12O19/Fe3O4/SiO2 menunjukkan nilai magnetisasi saturasi (Ms), magnetisasi remanensi (Mr) dan koersivitas (Hc) menurun saat milling selama 0 dan 50 jam. Sedangkan saat milling selama 10 dan 20 jam terjadi peningkatan nilai (Mr, Ms, dan Hc). Material nanokomposit BaFe12O19/Fe3O4/SiO2 untuk x = 5% milling selama 50 jam efektif dijadikan aplikasi material gelombang mikro. Hal ini dikarenakan semakin lama waktu milling semakin kecil nilai RL-nya dan semakin besar presentase gelombang mikro yang diserap oleh material. Hasil ini relevan dengan hasil penelitian sebelumnya. Untuk waktu milling selama 50 jam nilai reflection loss RL-nya kurang lebih -13 dB pada frekuensi sekitar 9.8 GHz dengan penyerapan sebesar 95% untuk x = 5%. Sedangkan sifat penyerapan gelombang mikro tanpa penghalusan untuk x = 10% nilai reflection loss RL-nya kurang dari -6.5 dB pada frekuensi sekkitar 9.6 GHz dengan penyerapan sebesar 77%. Kata kunci: Barium heksaferit, nanokomposit, BaFe12O19/Fe3O4/SiO2, mechanical milling, gelombang mikro **************************************************** ADAYILA MUDA MUTIARA. Synthesis of BaFe12O19/Fe3O4/SiO2 Nanocomposite Material as a Microwave Absorbing Application. Undergraduate Thesis, Physics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta. July 2024. Barium hexaferrite (BaFe12O19) is a permanent magnetic material with hard magnetic properties, making it a material that can be utilized in various advanced technological applications. A synthesis process of BaFe12O19/Fe3O4/SiO2 nanocomposite material has been carried out as an application for microwave absorption using the mechanical milling method. This research developed the synthesis of BaFe12O19 modified with the addition of Fe3O4 and SiO2 elements at 0%, 5%, 10%, and 15%, as well as varying the milling time for 0 hours, 10 hours, 20 hours, and 50 hours. Digital microscope, Permagraph, and Vector Network Analyzer (VNA) were used to analyse the surface morphology, magnetic properties, and microwave absorption properties. The results obtained after four milling variations for each sample show that the grain size decreases with increasing milling time. The magnetic properties of the BaFe12O19/Fe3O4/SiO2 nanocomposite material show that the saturation magnetization (Ms), remanent magnetization (Mr), and coercivity (Hc) values decrease during 0 and 50 hours of milling. Meanwhile, during 10 and 20 hours of milling, there is an increase in the (Mr, Ms, and Hc) values. The BaFe12O19/Fe3O4/SiO2 nanocomposite material for x = 5% milled for 50 hours is effectively used as a microwave material application. This is because the longer the milling time, the smaller the RL value and the greater the percentage of microwaves absorbed by the material. These results are relevant to the results of previous studies. For 50 hours of milling, the RL value is approximately -13 dB at a frequency of around 9.8 GHz with an absorption of 95% for x = 5%. While the microwave absorption properties without milling for x = 10% have an RL value of less than -6.5 dB at a frequency of around 9.6 GHz with an absorption of 77%. Keywords: Barium hexaferrite, nanocomposite, BaFe12O19/Fe3O4/SiO2, mechanical milling, microwave

Item Type:	Thesis (Sarjana)
Additional Information:	1). ERFAN HANDOKO 2). MANGASI ALION MARPAUNG
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Users 24939 not found.
Date Deposited:	14 Aug 2024 01:04
Last Modified:	14 Aug 2024 01:04
URI:	http://repository.unj.ac.id/id/eprint/49550

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