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Astari, Ratih Resti
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Density and Magnetic Properties of Barium Ferrite from BaFe12O19 Nanoparticles Prepared by Microemulsion Method Kuncoro, Handoko Setyo; Sulistarihani, Naniek; Manullang, Ria Julyana; Astari, Ratih Resti
Jurnal Keramik dan Gelas Indonesia Vol 24, No 2 (2015): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

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Abstract

The density and magnetic properties of barium ferrite from BaFe12O19 Nanoparticles prepared by microemulsion method have been studied by comparing with the properties of micro-scaled BaFe12O19 prepared by metallurgical method. The preceding preparation consists of emulsification process, mixing, aging, centrifuging/separation, drying, grinding, and calcination at temperature of 900 oC, which brings on  the BaFe12O19 nanoparticles powder as its final product. Then, the obtained powders have been formed at compaction pressure of 200 Kg/cm2 and sintered at temperature of 1100 oC. The indications of formed BaFe12O19 nanoparticles have been confirmed via XRD and TEM testings which their dimension sizes are under 100 nm. Based on density measurements, the density of barium ferrite prepared by microemulsion method is higher than that of by metalurgical method (i.e. 5,3 gr/ml). While, the permagraph examinations have indicated that both remanence magnetic induction (2.49 kOe) and maximum energy product values (0.47 MGOe) of barium ferrite prepared by microemulsion method are higher about 1.22 and 1.47 times, respectively.
Pengaruh Komposisi Bahan Barium Ferit dan NdFeB pada Sifat Kemagnetan Komposit BaFe/NdFeB Kuncoro, Handoko Setyo; Astari, Ratih Resti; Rahayu, Tita Oktavia Cahya
Jurnal Keramik dan Gelas Indonesia Vol 25, No 1 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

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Studi tentang pengaruh komposisi bahan-bahan sumber (penyusun) terhadap sifat kemagnetan komposit magnet BaFe/NdFeB beserta sintesis barium ferit dan NdFeB yang dibantu binder PEG (polyethylene glycol) 6000. Keberhasilan sintesis bahan komposit tersebut bisa ditunjukkan dengan beberapa hasil pengujian seperti pengujian SEM, uji gores, dan pengujian DTA/TG. Morfologi dari komposit yang dibentuk dari bahan sumber (BaFe, NdFeB dan binder PEG) bisa teridentifikasi dengan baik oleh mikrograf SEM. Hasil uji gores menunjukkan bahwa penambahan binder PEG 6000 terbaik adalah 7,5% dari berat total. Sedangkan hasil uji DTA/TG memberikan data suhu degradasi termal komposit minimum (350°C) masih dibawah temperatur Curie bahan NdFeB. Hasil penelitian juga membuktikan bahwa komposisi  bahan sumber komposit kurang berpengaruh terhadap sifat koersifitas magnetik tetapi lebih mempengaruhi terhadap sifat retentivitas magnet (induksi remanen) komposit BaFe/NdFeB. Tren pengaruh komposisi bahan penyusun terhadap sifat induksi remanen magnetik (Br) kompositnya mendekati formulasi untuk menghitung konduktivitas komposit.
Characterization of Magnetic and Density Properties on Barium Ferrite with MnO2 Addition Astari, Ratih Resti; Kuncoro, Handoko Setyo; Rahman, Didit Nur; Kristiantoro, Toni
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

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Abstract

The addition of MnO2 in synthesis of barium ferrite magnet were prepared by powder metallurgy method with variation formula of MnO2 0%, 0.1%, 0.2%, 0.3%, 0.5% and 1% sintered at 1175 ºC. Material characterization includes X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and permagraph were employed to investigate the effect of MnO2 addition to magnetic properties and sample density. Hysteresis curve using permagraph showed that the addition of MnO2 have an effect on the increasing of magnetic properties and density. Remanence induction (Br), coercivity (Hc) and density (ρ) reached the maximum value of 1.36 kG, 2.757 kOe and 4.29 g/cm3  respectively  on different formula MnO2. The best value of MnO2 addition could be concluded on the addition MnO2 of 0.3% with Br = 1.36 kG, Hc = 2.683 kOe, and ρ = 4.29 g/cm3. The XRD results showed the formed of barium ferrite phase in the sintered sample at 1175ºC. While the SEM result revealed that the addition of MnO2 affected the density of barium ferrite particles.
Co-Authors Kristiantoro, Toni Kuncoro, Handoko Setyo Kuncoro, Handoko Setyo Manullang, Ria Julyana Rahayu, Tita Oktavia Cahya Rahman, Didit Nur Sulistarihani, Naniek