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EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE Soehada, Achmad Maulana; Sebayang, Kerista; Sudiro, Toto; Kurniawan, Candra; Sebayang, Perdamean
Jurnal Sains Materi Indonesia Vol 15, No 4: JULI 2014
Publisher : BATAN

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Abstract

EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE. Mn-Ti doped (0, 0.1, 0.4, 0.5, and 0.6 mole%-barium hexaferrite powders have been prepared from BaCO3, Fe2O3, TiO2 andMnO powder by mechanical alloying technique for 20 hours. The mixture powder were grinded and then dried at 100 °C for 24 hours, followed by calcined at 1,000 °C for 2 hours. The calcined powder was then crushed into 400 mesh (38 μm) in particle size. X-Ray Diffraction analysis was performed to determine the phase formed. The powder was mixed with 3 wt%Celuna WE -518 polymer, and compressed with applied force of 5 tons. The sintering process was done at temperatures of 1100 °C and 1150 °C for 2 hours. The microstructure of sintered samples was observed by Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS). The magnetic properties and Reflection Loss (RL) was measured by permeagraph Magnet-Physik and Vector Network Analyzer (VNA), respectively. The results show that the remanance (Br) of samples are likely to decrease with increase in %mol of Mn-Ti and the optimum coercivity (HCJ) 4,42 kOe was achieved at 0,5 mole% Mn-Ti. The maximum reflection loss of -25,6 dB was obtained at 0,4mole%Mn-Ti with sintering temperature of 1100 °C for 2 hours. Accordingly, it can be potentially used for microwave absorption application.
PREPARATION AND CHARACTERIZATION OF BaO.6Fe2O3 BONDED MAGNET WITH PARTICLE SIZE VARIATION Sari, Ayu Yuswita; Sebayang, Perdamean; ., Muljadi
Jurnal Sains Materi Indonesia Vol 13, No 3 (2012): Juni 2012
Publisher : BATAN

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Abstract

Bonded magnets BaO.6Fe2O3 with various grain size i.e. 74, 105, 150, 300, 425, 600 and 850 μm have been synthesized. Composition of BaO.6Fe2O3 and epoxy was fixed i.e. 97 : 3 in weight percent. Turbidity and true density test associated its correlation by grain size. The result shows that turbidity SD BaO.6Fe2O3 and the square root of average particle diameter have linear relationship. True density value of BaO.6Fe2O3 around 5.2-5.6 g/cm3. This magnet powder molded cilindrical, magnetized, burned and then measured its physcal properties. Correlation between density and grain size is inversely proportional. The maximum density is 3.12 g/cm3 for BaO.6Fe2O3 until size 74 μm. At the same size have hardness brinell maximum 26 HB and inductance remance (Br) maximum 1.23 kG. The results of this study show that the smaller the particle size does not directly increase the magnetic field strength generated. This phenomenon needs to be seen again by linking themicro-structure correlation, homogeneity, and the improvement of the printing process with a strong magnetic field.Keywords: BaO.6Fe2O3, Turbidity, Density, Hardness brinell HB, Characteristic of magnet.
ANALISYS OF CRYSTAL STRUCTURE SrO.6Fe2O3 USING GENERAL STRUCTURE ANALYSIS SYSTEMAND ITSMAGNETIC PROPERTIES Sebayang, Perdamean; ., Muljadi; Adi, Wisnu Ari
Jurnal Sains Materi Indonesia Vol 12, No 3 (2011): Juni 2011
Publisher : BATAN

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Abstract

The analysis of SrO.6Fe2O3 single phase has been performed by using General Structure Analysis System (GSAS) and its magnetic properties has been measured by using Vibrating Sample Magnetometer (VSM). The SrO.6Fe2O3 magnetic material system is synthesized by solid state reaction method through the mechanical alloying process and sintered at 1200 °C for 10 hours. The refinement result of x-ray diffraction showed that the single phases of the SrFe12O19 magnetic material system is formed with the hexagonal crystal structure (space group P 63/mmc), lattice parameters a = b = 5. 9033(5) Å and c = 23.239(2) Å, α = β = 90°, γ = 120o, cell unit volume 701.3(1) Å3, and atomic density of ρ = 5.72 g.cm-3. The hexagonal structure with space group P 63/m m c is constructed from 4 building blocks, namely two S blocks (Fe63+O8 2-)2+ and two R blocks (Sr2+Fe63+O112-)2-. The result from magnetic properties measurement showed that the sample has coercive field, saturated magnetization, and remanence magnetization of 1650 Oe, 63.01 emu/g and 48.21 emu/g respectively.Keywords: SrO.6Fe2O3, Mechanical milling, Crystal structure, Magnetic properties.
Efek Aditif 3Al2O3.2SiO2 dan Suhu Sintering terhadap Karakteristik Keramik -Al2O3 Sebayang, Perdamean; Tetuko, Anggito Pringgo; Khaerudini, Deni Shidqi; Muljadi, Muljadi; Ginting, Masno
Jurnal Fisika dan Aplikasinya Vol 3, No 2 (2007)
Publisher : Jurnal Fisika dan Aplikasinya

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Abstract

Telah dilbuat keramik corundum (-Al2O3) menggunakan serbuk Al2O3 dan masing-masing ditambah: 10, 15, 20 dan 25% (berat) 3Al2O3.2SiO2, digiling 24 jam, lolos ayakan 200 mesh, dikeringkan 110C, dicetak 50 Mpa, dan disintering pada suhu: 1300, 1400, 1500 dan 1600C. Sebesar 20% aditif 3Al2O3.2SiO2 dan suhu sintering 1600C merupakan kondisi optimum, menghasilkan: densitas = 3,47 g/cm3, porositas = 0,64%, kekerasan (Hv) = 1454 kgf/mm2, kuat patah = 313 MPa, dan koesien ekspansi termal = 6,3 x 10−6 C−1.Corundum (-Al2O3) merupakan fasa dominan, partikelnya bulat, grain size: 0,3-0,8 μm dan minornya adalah mullite (Al2O3.2SiO2), berbentuk jarum, dan grain size: 0,3-3,0 μm.
REMANENSI DAN FLUX DENSITY DARI BERBAGAI BENTUK GEOMETRI MAGNET PERMANEN Nurdiyansyah, Lukman Faris; Tetuko, Anggito P.; Aryanto, Didik; Sebayang, Perdamean
Telaah Vol 32, No 1 (2014)
Publisher : Research Center for Physics

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Abstract

dari berbagai bentuk geometri magnet permanen berbasis ferrite (BaFe12O19) dan logam tanah jarang (NdFeB). Nilai remanensi magnet (Br) diperoleh dari kurva histerisis (B-H curve) yang diukur dengan alat permagraph dan flux density Bz diukur secara langsung dengan menggunakan gaussmeter. Bentuk geometri dan jenis sampel uji adalah cube, ring, dan disk dari magnet permanen berbasis NdFeB dan BaFe12O19. Dari hasil penelitian diketahui bahwa magnet permanen berbasis NdFeB memiliki nilai remanensi yang lebih besar dibanding dengan magnet permanen berbasis BaFe12O19. Dari pengukuran magnet permanen berbasis BaFe12O19 didapatkan nilai Br = 1:17 kG untuk bentuk geometri ring dan untuk disk didapat sebesar Br = 1:78 kG, sedangkan dari magnet permanen berbasis NdFeB yang berbentukcube (tipe 1), cube tipe 2, dan disk didapatkan nilai Br = 7:5 kG, Br = 10:8 kG, dan Br = 5:2 kG. Untuk pengukuran flux density Bz sebagai fungsi jarak z didapatkan kesesuaian antara eksperimen dan teori. Berdasarkan hasil penelitian didapatkan bahwa nilai Br dan Bz sangat dipengaruhi oleh bentuk geometri dan jenis magnet permanen.
PENGARUH KECEPATAN ROTOR DAN MAGNETIC FLUX DENSITY TERHADAP OUTPUT TEGANGAN GENERATOR AXIAL FLUX PERMANENT MAGNET Sebayang, Perdamean; Nurdiyansyah, Lukman Faris; Ginting, Masno; Prasetya, Fresky Agung; Siregar, Masbah Rotuante Tagore
Telaah Vol 32, No 2 (2014)
Publisher : Research Center for Physics

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Pada penelitian ini akan dikaji pengaruh kecepatan putar rotor n dan kerapatan fluks magnet Br terhadap output tegangan, Erms melalui simulasi dan analisis pada generator axial flux permanent magnet (AFPM). Generator fluks aksial magnet permanen yang dibuat dalam penelitian ini adalah terdiri atas dua rotor yang menggunakan magnet permanen NdFeB dengan Br = 0.2 Tesla dan satu stator dengan jumlah 9 kumparan, 70 lilitan, dan 3 fase. Dari hasil ujicoba generator yang dibuat output tegangan mulai terbaca apabila kecepatan putaran > 228 rpm. Sedangkan dari hasil simulasi, tegangan dapat terbaca setelah putaran pertama. Pada kecepatan rotor 1000 rpm, korelasi antara kerapatan fluks magnet, Br terhadap output tegangan induksi generator Erms adalah Erms = 34.706Br. Apabila kecepatan rotor ditingkatkan menjadi 1.5 kali, maka Erms juga akan meningkat sebesar 1.5 kalinya.
EFFECTS OF CURING TEMPERATURE AND ATMOSPHERE ON THE PROPERTIES OF ISOTROPIC BONDED NdFeB MAGNETS. Sudiro, Toto; Wismogroho, Agus Sukarto; Sebayang, Perdamean
Jurnal Sains Materi Indonesia Vol 16, No 2: JANUARI 2015
Publisher : BATAN

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EFFECTS OF CURING TEMPERATURE AND ATMOSPHERE ON THE PROPERTIES OF ISOTROPIC BONDED NdFeB MAGNETS. The purpose of this paper was to synthesize the isotropic bonded NdFeB magnets at varying curing temperature and atmosphere, and to clarify their properties. For the aforesaid objective, the NdFeB powder was mixed with polyacrylate binder (3wt%) and compacted by hydraulic pressure with a compressive pressure of 30 MPa. The specimens were then separately cured at 100, 150, 180 and 200°C for 1 h in air and vacuum. The effects of curing temperature in air and vacuum on the bulk density and magnetic properties of isotropic bonded NdFeB magnets were studied. The results indicated that the bulk density and fluxmagnet density of bonded NdFeB magnets decreased with increase in curing temperature. This seems to be due to the binder vaporization and oxidation of element of NdFeB magnet. The bulk density of specimens cured in air was higher than that in vacuum for all temperatures. On the contrary, the magnetic flux density showed the opposite behavior. The optimum magnetic properties were achieved at curing temperature of 100oC for 1 h in vacuumwith Br = 6,61 kG, HCJ = 8,841 kOe, and BHmax = 9,01 MGOe.
EFEK ADITIF FeMo DAN PROSES KALSINASI PADA SERBUK MAGNETIK BaFe12O19 Sari, Ayu Yuswita; Safira, Cut Hani; Setiadi, Eko Arief; Simbolon, Silviana; Kurniawan, Candra; Sebayang, Perdamean
Jurnal Sains Materi Indonesia Vol 18, No 3: April 2017
Publisher : BATAN

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Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembuatan magnet permanen bariumheksaferit (BaFe12O19). Proses pembuatan magnet bariumheksaferit dilakukan denganmetode mechanical alloying. Serbuk hasil mixing antara BaFe12O19dan FeMo dikalsinasi dengan variasi suhu kalsinasi 1000 oC dan 1200 oC. Karakterisasi yang dilakukan meliputi sifat fisis dan magnetik, dengan menggunakan X-Ray Diffraction (XRD) dan piknometeruntuk mengetahui fasa dan nilai densitas magnet, serta menggunakanVibrating SampleMagnetometer (VSM) pada pengukuran sifatmagnetikmagnet bariumheksaferit. Dari hasil eksperimen, dapat diketahui bahwa penambahan aditif FeMo dapat menaikkan nilai densitas pada serbuk bariumheksaferit. Hasil analisis sifat magnetik, dapat diketahui bahwa penambahan aditif FeMo secara keseluruhan menurunkan sifat magnetik magnet. Namun penambahan %wt FeMo menaikkan nilai remanensi, saturasi dan energi produk maksimum (BHmax) magnet barium heksaferit, meskipun nilai koersivitas magnet tetap menurun. Sedangkan kenaikan suhu kalsinasi mampu menaikkan nilai remanensi, dan BHmax, namun menurunkan nilai koersivitas dan saturasi dari magnet barium heksaferit. Hal ini menunjukkan penambahan zat aditif FeMo mampu mengubah struktur material magnet permanen barium heksaferit dari hard magnetik menjadi soft magnetik material. Nilai optimumdihasilkan pada komposisi penambahan 5 %wt aditif FeMo dengan nilai densitas serbuk 3,71 g/cm3 sebelum dikalsinasi, dan memiliki sifat magnetik seperti: saturasi 2,12 kG, remanensi 1,15 kG, koersivitas 0,45 kOe dan BHmax0,145 MGOe setelah dikalsinasi pada suhu 1000 oC.
CHARACTERIZATION OF NATURAL IRON SAND FROM KATA BEACH, WEST SUMATRA WITH HIGH ENERGY MILLING (HEM) Rianna, Martha; Sembiring, Timbangen; Situmorang, Marhaposan; Kurniawan, Candra; Setiadi, Eko Arief; Tetuko, Anggito P; Simbolon, Silviana; Ginting, Masno; Sebayang, Perdamean
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Syiah Kuala University

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Iron sand is one of the natural resources in West Sumatra that has not been optimally utilized. One of the potential locations to get this iron sand deposits is the coast of Kata. This study aims to analyze the content and size of the iron grains found on the coast of Kata Padang Beach, West Sumatera Province. Coastal sand samples are extracted using permanent magnets to separate magnetic and non-magnetic materials. Characterization of iron sand using Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). The result of characterization using SEM-EDX shows that iron sand samples contain Fe and O elements derived from Phase Magnetite (Fe3O4).  Keywords: iron sand, magnetic materials, SEM-EDX, VSM
PEMBUATAN DAN KARAKTERISASIMAGNET BONDED BaO.6 Fe2O3 DENGAN VARIASI UKURAN PARTIKEL Sari, Ayu Yuswita; Sebayang, Perdamean; Muljadi, Muljadi
Jurnal Sains Materi Indonesia Vol 13, No 3: Juni 2012
Publisher : BATAN

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PEMBUATAN DAN KARAKTERISASIMAGNET BONDED BaO.6 Fe2O3 DENGAN VARIASI UKURAN PARTIKEL. Telah dilakukan pembuatanmagnet bonded BaO.6 Fe2O3 dengan variasi ukuran partikel yaitu : 74 μm, 105 μm, 150 μm, 300 μm, 425 μm, 600 μm dan 850 μm. Perbandingan BaO.6 Fe2O3 dengan epoksi sebagai perekat/pengikat (bond) dibuat tetap yaitu 97 : 3 %berat. Pengujian tingkat kekeruhan dan true density dikaitkan korelasinya dengan ukuran butir partikel. Dari hasil pengujian diketahui bahwa Standar Deviasi (SD) tingkat kekeruhan serbuk magnet BaO.6 Fe2O3 berbanding lurus dengan akar rata-rata diameter partikel. Nilai true density serbuk magnet BaO.6 Fe2O3 berkisar antara 5,2 g/cm3 hingga 5,6 g/cm3. Serbuk magnet tersebut kemudian dicetakmenjadi pelet, dimagnetisasi, dicuring dan selanjutnya diukur sifat fisisnya. Hasil analisis menunjukkan bahwa korelasi nilai densitas terhadap ukuran partikel adalah berbanding terbalik. Nilai densitas maksimum yang diperoleh adalah 3,12 g/cm3 untuk serbuk magnet BaO.6 Fe2O3 ukuran butir hingga 74 μm. Untuk ukuran butir yang sama menunjukkan nilai kekerasan HB tertinggi yaitu 26 HB dan nilai induksi remanensi (Br) tertinggi sebesar 1,23 kG. Hasil percobaan inimenunjukkan bahwa semakin kecil ukuran partikel tidak secara langsungmeningkatkan kuat medan magnet yang dihasilkan.