PENGARUH SUBSTITUSI Ca PADA BARIUM HEKSAFERIT (BaFe12O19) SEBAGAI MATERIAL PENYERAP GELOMBANG RADAR

ASIDIQ SAPUTRA, . (2022) PENGARUH SUBSTITUSI Ca PADA BARIUM HEKSAFERIT (BaFe12O19) SEBAGAI MATERIAL PENYERAP GELOMBANG RADAR. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Barium heksaferit adalah magnet oksida heksaferit yang berisfat ferromagnetic. Penelitian tentang pengaruh subtitusi Ca pada Barium Heksaferit (BaFe12O19) sebagai material penyerap gelombang radar telah dilakukan. Sintesis nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 menggunakan metode reaksi zat padat. Berdasarkan penelitian yang telah dilakukan, telah berhasil dibuat nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 sebagai material penyerap gelombang radar. Hasil analisis XRD nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 menunjukkan fasa tunggal BaFe12O19 dan Fe2O3 dengan struktur kristal heksagonal. Sifat kemagnetan nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 menunjukkan peenurunan nilai magnetisasi remanensi (Mr) dan magnetisasi saturasi (Ms) serta peningkatan nilai medan koersivitas (Hc) seiring dengan meningkatknya penambahan massa Ca (x). Nilai Hc yang tinggi menunjukkan material terbentuk sebagai hard magnetic. Sifat penyerapan gelombang radar nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 yang optimal ketika x = 0.1 dengan waktu penghalusan (milling) selama 50 jam. Hal ini dikarenakan (Ca0.1Ba0.9)Fe12O19 dengan pengahlusan selama 50 jam memiliki nilai Refelection Loss (RL) minimum sebesar -21.989 dB, bandwith (< -5 dB) sebesar 4.2 GHz, Bandwith (< -10 dB) sebesar 2.549 GHz, presentase absorption material maksimum sebesar 43.854% dan presentase absorption material + transmission maksimum (gelombang yang tidak dipantulkan kembali) sebesar 99.368%. Nanokristal magnet oksida (CaxBa1-x)Fe12O19) tanpa dilakukan penghalusan memiliki sifat penyerapan gelombang radar yang kecil, dibandingkan nanokristal magnet oksida heksaferit (CaxBa1-x)Fe12O19 dengan penghalusan selama 50 jam. ****************************************** Barium hexaferrite is a ferromagnetic hexaferrite oxide magnet. Research on Effect of Ca substitution on Barium Hexaferrite (BaFe12O19) as radar wave absorbing material has been done. Synthesis of hexaferrite oxide magnetic nanocrystal (CaxBa1-x)Fe12O19 using the Solid State Reaction method. Based on the research that has been done, it has been successfully made into magnetic oxide hexaferrite nanocrystal (CaxBa1-x)Fe12O19 as a radar wave absorbing material. XRD analysis results of hexaferrite oxide magnetic nanocrystal (CaxBa1-x)Fe12O19 showed single-phase BaFe12O19 and Fe2O3 with a hexagonal crystal structure. The magnetic properties of hexaferrite oxide magnetic nanocrystal (CaxBa1-x)Fe12O19 showed a decrease in the value of remanence magnetization (Mr) and saturation magnetization (Ms) and an increase in field coercivity (Hc) along with the addition of mass Ca (x). A high Hc value indicates the material is formed as a hard magnetic. When x = 0.1 with a rarefaction time of 50 hours, the hexaferrite oxide magnetic nanocrystal (CaxBa1-x)Fe12O19 showed its best radar wave absorption capabilities. Considering (Ca0.1Ba0.9)Fe12O19 with 50 hours of removal has a minimum reflection loss value of -21.989 dB, bandwidth (< -5 dB) of 4.2 GHz, bandwidth (< -10 dB) of 2.549 GHz, maximum material absorption percentage of 43.854% and maximum material absorption + transmission percentage (waves that are not reflected back) of 99.368%. Nanocrystal magnetic oxide (CaxBa1-x)Fe12O19 without refining has the properties of absorption of radar waves that are small compared to nanocrystal magnetic oxide hexaferrite (CaxBa1-x)Fe12O19 with refining for 50 hours.

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:	sawung yudo
Date Deposited:	29 Oct 2024 03:28
Last Modified:	29 Oct 2024 03:28
URI:	http://repository.unj.ac.id/id/eprint/51791

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