Synthesis and characterization of nanocrystalline BaFe12O19 obtained at 850°C by using ammonium nitrate melt

Topal, Uğur; Özkan, H.; Sözeri, H.

doi:10.1016/j.jmmm.2004.07.009

Cited by 84 publications

(46 citation statements)

References 14 publications

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“…Komposisi sistem barium heksaferat BaFe 12 O 19 dalam aplikasinya sebagai magnet permanen cukup luas digunakan sampai saat ini sejak dipublikasikan oleh Phillips [3]. Material magnet permanen sistem BaFe 12 kemagnetan sampai saat ini terus berjalan oleh banyak peneliti [4][5][6][7][8].…”

Section: Pendahuluanunclassified

“…Material magnet permanen sistem BaFe 12 kemagnetan sampai saat ini terus berjalan oleh banyak peneliti [4][5][6][7][8]. Proses preparasi baik itu teknik konvensional seperti Powder Metallurgy [9] maupun rekayasa dalam proses pembentukan [10][11][12] telah mampu menghasilkan sifat kemagnetan ekstrinsik yang optimal. Hal ini menunjukkan bahwa seolaholah jenis-jenis senyawa magnetik ini menjadi sangat mendesak untuk dikembangkan.…”

Section: Pendahuluanunclassified

“…Pembentukan material magnet komposit BaFe 12 O 19 /H Fe dengan proses milling telah berhasil dilakukan. Proses milling dengan waktu 30 jam secara signifikan berpengaruh terhadap reduksi ukuran partikel dan mengakibatkan perubahan sifat kemagnetan.…”

Section: Kesimpulanunclassified

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PENGARUH UKURAN PARTIKEL TERHADAP SIFAT KEMAGNETAN MATERIAL MAGNET KOMPOSIT BaFe12O19/ααFe

Handoko

Budi

Soegijono

2013

JRSKT

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AbstrakPembentukan material magnet komposit yang terdiri serbuk barium heksaferat, BaFe 12 O 19 , dan serbuk besi BCC, αFe, dengan perbandingan 60:40 % berat telah dilakukan. Proses penghalusan ukuran partikel magnet komposit dengan menggunakan planetary ball mill (PBM) dalam suasana toluen selama 30 jam bertujuan untuk meningkatkan sifat kemagnetan. Identifikasi fasa magnet komposit diperoleh hasil pengukuran dengan difraksi sinar-X radiasi Kα Co. Foto morfologi bentuk partikel magnet komposit menggunakan scanning electron microscope (SEM) 5310LV Jeol pada perbesaran 2000 kali. Distribusi ukuran partikel diketahui dengan LS Particle Size Analyzer (PSA) Beckman Coulter dan sifat kemagnetan dianalisis dengan alat Permagraph pada temperatur kamar. Hasil pengukuran menunjukkan bahwa selama penghalusan ukuran partikel material magnet komposit melalui proses milling tidak terjadi dekomposisi fasa, distribusi ukuran serbuk cendrung menurun dengan bertambahnya waktu milling. Pengaruh terhadap sifat kemagnetan material magnet komposit BaFe 12 O 19 /αFe yang mengalami penurunan magnetisasi sisa atau remanen dari 0,32 T menjadi 0,15 T dan nilai koersivitas magnetik 228,3 kA/m menjadi 42,5 kA/m. Namun nilai magnetisasi saturasi cendrung meningkat dari 0,59 T menjadi 0,80 T.

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Section: Pendahuluanunclassified

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PENGARUH UKURAN PARTIKEL TERHADAP SIFAT KEMAGNETAN MATERIAL MAGNET KOMPOSIT BaFe12O19/ααFe

Handoko

Budi

Soegijono

2013

JRSKT

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“…A variety of techniques have been employed for the synthesis of nanoparticles with definite shapes and sizes (Wiley et al 2005;Pileni et al 1999;Murphy and Jana 2002). Hexagonal ferrites are prepared by using various synthesis routes like chemical precipitation (Pankov et al 1993), ammonium nitrate melts (Topal et al 2004), precipitation in alcohol (Lisjak and Drofenik 2007a, b), reverse micelle-based method (Xu et al 2008), low-temperature combustion synthesis (Huang et al 2004), mechanical alloying synthesis (Sharma et al 2007), citrate precursor synthesis (Sankaranarayanan et al 1993) and hydrothermal synthesis (Duong et al 2007;Drofenik et al 2007), etc. By using above synthesis methods hardagglomerated particles with large diameters and irregular morphologies were produced.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of nanocrystalline BaFe12O19 synthesized by microwave-hydrothermal method

et al. 2012

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Nanocrystalline BaFe 12 O 19 powders were prepared by microwave-hydrothermal method at 200°C/ 45 min. The as-synthesized powders were characterized by using X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The present powders were densified at different temperatures, i.e., 750, 850, 900 and 950°C for 1 h using microwave sintering method. The phase formation and morphology studies were carried out using XRD and field emission scanning electron microscopy (FE-SEM). The average grain sizes of the sintered samples were found to be in the range of 185-490 nm. The magnetic properties such as saturation magnetization and coercive field of sintered samples were calculated based on magnetization curves. A possible relation between the magnetic hysteresis curves and the microstructure of the sintered samples was investigated.

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“…Hexagonal platelet shape with easy axis normal to plane, moderate coercivity, chemical stability and high Curie temperature are some of the advantages of barium ferrite which makes it suitable for these applications. In addition, development of wireless and radar electronics needs low loss magnetic microwave devices and barium ferrite is a suitable candidate for microwave device applications [1][2][3][4][5][6]. There have been attempts for production of nanoparticles of barium ferrite in recent years using methods such as solgel [7,8], microwave-assisted sol-gel auto-combustion [9], auto-combustion [10], hydrothermal [11], co-precipitation [12], self-propagation high-temperature synthesis [13], carbon combustion [14], spray pyrolysis [15], aerosol [16] and molten salt [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of Milling Atmosphere on Synthesis of Barium Ferrite/Magnetite Nanocomposite

Molaei

Ataie

Raygan

et al. 2011

J Supercond Nov Magn

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In this research, barium ferrite /magnetite nanocomposites synthesized via a mechano-chemical route. Graphite was used in order to reduce hematite content of barium ferrite to magnetite to produce a magnetic nanocomposite. The effects of processing conditions on the powder characteristics were investigated by XRD, VSM, and HRTEM techniques. XRD results revealed that milling under air and argon atmospheres resulted in the appearance of Fe 3 O 4 peaks beside BaFe 12 O 19 peaks after 15 and 20 hrs milling, respectively. The intensity of Fe 3 O 4 peaks in the XRD patterns increased by increasing the milling time. VSM studies revealed that saturation magnetization of the 40-hrs milled samples under air and argon atmospheres was 31.25 and 36.42 emu/g, respectively. This difference might be due to more Fe 3 O 4 content in the latter sample. By annealing of the 40-hrs milled sample in air, saturation magnetization increased to 139.12 emu/g.

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Synthesis and characterization of nanocrystalline BaFe12O19 obtained at 850°C by using ammonium nitrate melt

Cited by 84 publications

References 14 publications

PENGARUH UKURAN PARTIKEL TERHADAP SIFAT KEMAGNETAN MATERIAL MAGNET KOMPOSIT BaFe12O19/ααFe

PENGARUH UKURAN PARTIKEL TERHADAP SIFAT KEMAGNETAN MATERIAL MAGNET KOMPOSIT BaFe12O19/ααFe

Structural and magnetic properties of nanocrystalline BaFe12O19 synthesized by microwave-hydrothermal method

Investigation on the Effects of Milling Atmosphere on Synthesis of Barium Ferrite/Magnetite Nanocomposite

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