PENGARUH PERBANDINGAN KOMPOSISI PADA BaFe12O19/Fe3O4 STRUKTUR DAN SIFAT MAGNET

PRASETYO, LOIS (2018) PENGARUH PERBANDINGAN KOMPOSISI PADA BaFe12O19/Fe3O4 STRUKTUR DAN SIFAT MAGNET. S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

In this research, has been made a composite BaFe12O19/Fe3O4 of the material barium heksaferit (BaFe12O19) and mill scale as a source Fe3O4 using the technique of High Energy Milling (HEM) with milling time 3 hours by comparison of the composition the powder BaFe12O19 : Fe3O4 is 50% : 50%, 70% : 30% and 80% : 20%. Milling process wet milling method with ethanol as a medium. Characterization is done include analysis of the morphology and distribution of particles using Optical Microscope (OM), analysis of crystal structure by X-Ray powder Diffraction (XRD), and magnet properties with the Vibrating Sample Magnometer (VSM). The result, OM shows the longer milling result in particle size is getting smaller, tend to the occurrence and distribution of particle agglomeration increasingly homogenous. XRD analysis results shows have formed a composite structure BaFe12O19/Fe3O4 with BaFe12O19 as the major phases and Fe3O4 as the minor phases BaFe12O19 have a structure crystal hexagonal lattice parameter with a = 5.8930 Å and c = 23.1940 Å. Whereas Fe3O4 has a cubic crystal structure with lattice parameters a = 8.3950 Å. The result of VSM analysis showed that the optimum condition of BaFe12O19 / Fe3O4 composite was achieved in the comparison 50% : 50% of 3-hour milling process composition by mangnetisasi saturation (Ms) = 51.61 emu / g, remanent magnetization (Mr) = 21.83 emu / g and coercivity (Hc) 786.32 Oe, and energy maximum product (BHMax) = 37976.05 kGOe. Keywords: Magnetic Composite, Barium Hexaferrite, Magnetite, High Energy Milling, Maximum Energy Product Dalam penelitian ini, telah dibuat komposit BaFe12O19/Fe3O4 dari bahan barium heksaferit (BaFe12O19) dan mill scale sebagai sumber Fe3O4 menggunakan teknik High Energy Milling (HEM) dengan waktu milling 3 jam dengan perbandingan komposisi serbuk BaFe12O19 : Fe3O4 adalah 50% : 50%, 70% : 30% dan 80% : 20%. Proses milling menggunakan metode wet milling dengan ethanol sebagai media. Karakterisasi yang dilakukan meliputi analisis morfologi dan distribusi partikel menggunakan Optical Microscope (OM), analisis struktur kristal dengan X-Ray Powder Diffraction (XRD), dan sifat kemagnetan dengan Vibrating Sample Magnetometer (VSM). Hasil OM menunjukkan semakin lama waktu milling mengakibatkan ukuran partikel semakin kecil, cenderung terjadinya aglomerasi dan distribusi partikel semakin homogen. Hasil analisis XRD menunjukkan telah terbentuk struktur komposit BaFe12O19/Fe3O4 dengan BaFe12O19 sebagai fasa mayor dan Fe3O4 sebagai fasa minor. BaFe12O19 memiliki struktur kristal hexagonal dengan parameter kisi a = 5.8930 Å dan c = 23.1940 Å. Sedangkan Fe3O4 mempunyai struktur kristal cubic dengan parameter kisi a = 8.3950 Å. Hasil analisis VSM menunjukkan kondisi optimum komposit BaFe12O19/Fe3O4 dicapai pada perbandingan komposisi 50% : 50% proses milling 3 jam dengan mangnetisasi saturasi (Ms) = 51.61 emu/g, magnetisasi remanen (Mr) = 21.83 emu/g dan koersivitas (Hc) 786.32 Oe, dan energi produk maksimum (BHmaks) = 37976.05 kGOe. Kata kunci: Magnetik Komposit, Barium Heksaferit, Magnetit, High Energy Milling, Energi Produk Maksimum

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