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PREPARASI ULTRA FINE-GRAINED PADUAN HIDRIDA LOGAM SISTEM Mg-Fe MENGGUNAKAN TEKNIK MECHANICAL MILLING UNTUK HYDROGEN STORAGE Adi, Wisnu Ari; Suwarno, Hadi
Jurnal Teknologi Bahan Nuklir Vol 5, No 1 (2009): Januari 2009
Publisher : PTBN - BATAN

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ABSTRAK PREPARASI ULTRA FINE-GRAINED PADUAN HIDRIDA LOGAM SISTEM Mg-Fe MENGGUNAKAN TEKNIK MECHANICAL MILLING UNTUK HYDROGEN STORAGE. Telah dilakukan sintesis dan karakterisasi ultra fine-grained paduan hidrida logam sistem Mg-Fe untuk hydrogen storage. Ultra fine-grained paduan hidrida logam sistem Mg-Fe dibuat melalui proses mechanical milling campuran serbuk Mg dan Fe dengan variasi waktu milling selama 0, 10, 20, 30, 40, 50, 60 dan 70 jam. Hasil refinement pola difraksi sinar-X mengungkapkan bahwa ultra fine-grained paduan hidrida logam sistem Mg-Fe yang terbentuk meliputi fase Mg, Fe dan FeH yang ketiganya berukuran nanokristalin kurang dari 5 nm. Pengamatan mikrostruktur dengan SEM memperlihatkan bahwa sampel memiliki ukuran partikel sangat kecil sekitar 100 sampai 500 nm. Kesimpulannya adalah ultra fine-grained paduan hidrida logam sistem Mg-Fe untuk hydrogen storage dapat dipreparasi melalui teknik mechanical milling. KATA KUNCI: sistem Mg-Fe, mechanical milling, ultra fine-grained ABSTRACT PREPARATION OF ULTRA FINE-GRAINED METAL HYDRIDE ALLOY OF Mg-Fe SYSTEM BY MECHANICAL MILLING FOR HYDROGEN STORAGE APPLICATION. The synthesis and characterization of ultra fine-grained metal hydride alloy of the Mg–Fe system by mechanical milling technique have been performed. The Mg and Fe powders were mixed and milled with the variation of milling time 0, 10, 20, 30, 40, 50, 60 and 70 hours. The refinement of the X-ray diffractions reveals that the sample consists of three phases, namely nanocrystalline Mg, Fe, and FeH with the average grain size of approximately less than 5 nm. The observations of the microstructure using SEM shows that the sample consists of very small particles with sizes of about 100 – 500 nm. It is concluded that the ultra fine-grained metal hydride alloy of the Mg-Fe system for hydrogen storage application can be prepared by mechanical milling technique. FREE TERMS: Mg-Fe system, mechanical milling, ultra fine-grained
THE EFFECT OFCu-DOPING ON CRYSTAL STRUCTURE AND MAGNETORESISTANCE IN La0.73 Ca0.27 Mn1-y CuyO3 WITH 0 < y < 0.19 Gunanto, Y E; Kurniawan, B; Purwanto, A; Adi, Wisnu Ari; Poertadji, S
Jurnal Sains Materi Indonesia Vol 14, No 3: APRIL 2013
Publisher : BATAN

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THE EFFECT OFCu-DOPINGON CRYSTAL STRUCTURE AND MAGNETORESISTANCE IN La0.73 Ca0.27 Mn1-y CuyO3 WITH 0 < y < 0.19. We studied the crystal structure at room temperature and low temperature, as well as themagneto resistance as a functionmagnetic field at room temperature in the compound La0.73 Ca0.27 Mn1-y CuyO3 with 0 < y < 0.19. To analyze the crystal structure we used X-Ray Diffractometer (XRD) at room temperature and the neutron-powder-diffraction at room temperature and low temperatures. The neutron powder diffraction experiments were under taken with the High Resolution Powder Diffractometer (HRPD) (λ=1.8223 Å) at the Neutron Scattering Center of BATAN using the fullprof program. To analyze the magnetoresistance, we used a four point probe aparatus in the range ofmagnetic fields 0-7600 Oersted. we have found that no change in crystal structure despite of increasing value of y. All samples have structure orthorhombic with space group P nma, but the volume of lattice in low temperature is smaller than room temperature. At room temperature, increasing the value y impact declining value of magneto resistance.
STRUKTUR KRISTAL DAN MAGNETORESISTANCE PEROVSKITE La0,7Ca0,3MnO3 PADA SUHU KAMAR Sukirman, Engkir; Adi, Wisnu Ari; Purwamargapratala, Yustinus
Jurnal Sains dan Teknologi Nuklir Indonesia Vol 13, No 2 (2012): Agustus 2012
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STRUKTUR KRISTAL DAN MAGNETORESISTANCE PEROVSKITE La0,7Ca0,3MnO3PADA SUHU KAMAR. Studi banding struktur kristal dan magnetoresistance (MR) perovskiteLa0,7Ca0,3MnO3 (LCMO) terhadap senyawa induk LaMnO3 (LMO) dan CaMnO3 (CMO) telahdilakukan untuk mempelajari perubahan resistivitas LCMO akibat perubahan medan magnetluar pada suhu kamar. Cuplikan LCMO, LMO dan CMO disintesis dengan metode High EnergyMilling (HEM). Prekursor hasil milling dicetak menjadi pelet dan disinter pada Ts = 1350 ºCselama 6 jam. Analisis kualitatif dilakukan dengan teknik difraksi sinar-x metode Rietveld. EfekMR cuplikan diukur dengan metode Four Point Probe (FPP) dan morfologi permukaan peletdiamati dengan Scanning Electron Microscope (SEM). Ketiga cuplikan memiliki struktur kristalortorombik, grup ruang: Pnma, No. 62. Parameter kisi LCMO dapat dikonfirmasi hinggaketelitian 4 angka di belakang koma, yakni a = 5,4851(3) Å, b = 7,7601(4) Å, c = 5,5185(2) Å.Parameter kisi LMO dan CMO berturut-turut adalah: a = 5,4405(9)Å, b = 7,717(1) Å, c =5,537(1) Å dan a = 5,2973(6) Å, b = 7,477(1) Å, c = 5,281(1) Å. Cuplikan LCMO, LMO dan CMOmemiliki ukuran butir sekitar 1.000 nm, berbentuk bulat, dan setiap butir dibangun oleh rata-rata27 kristalit. Harga MR cuplikan LCMO, LMO dan CMO pada suhu kamar berturut-turut -10,1; -7,3 dan -12,3 %. Harga MR ini setara dengan harga GMR berbasis multilayers[Cu/NiFeCo]x10/Ta. Bulk perovskite La0,7Ca0,3MnO3 dapat dimanfaatkan untuk mendeteksimagnetic microbeads dan ferrofluid.
THE X-RAY DIFFRACTION ANALYSES ON THE MECHANICAL ALLOYING OF THE Mg2Ni FORMATION Suwarno, Hadi; Insani, Andon; Adi, Wisnu Ari
Jurnal Teknologi Bahan Nuklir Vol 3, No 2 (2007): Juni 2007
Publisher : PTBN - BATAN

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Hadi Suwarno*, Andon Insani**, Wisnu Ari Adi** * Centre for Nuclear Fuel Technology - BATAN ** Centre for Nuclear Industry Materials - BATAN Kawasan PUSPIPTEK, Tangerang 15314 ABSTRACT THE X-RAY DIFFRACTION ANALYSES ON THE MECHANICAL ALLOYING OF THE Mg2Ni FORMATION. The synthesis and characterization of Mg2Ni compound by using mechanical alloying technique have been performed. The material is milled under the varied milling time of 20, 25, 30, 35 and 40 hours. The result of measurements by using X-ray diffractometer showed that the refinement results on X-ray diffraction pattern appear to be very good fitting between calculation and observation. It is shown that the specimens consist of three phases, namely Mg2Ni, MgO and MgNi2. For milling time between 20 hours to 25 hours, the mass fraction of the Mg2Ni phase increases from 42.19% to 51.03%. Continuous milling of the specimen up to 40 hours will reduce the Mg2Ni mass fraction to 11.86%, probably due to the presence of oxygen, and consequently will increase the mass fraction of MgNi2 compound. It is concluded that the milling time will influence the formation of Mg2Ni phase. At this research, 25 hours milling time is the best time to obtain the highest formation of Mg2Ni compound. Microstructure analyses of the specimens indicate that milling time of 30 hours is the minimum time required to reduce the particle sizes of the Mg-Ni mixed specimen from 3,5 ~10 tm into nanosize particles. It starts to agglomerate after 40 hours of milling due to the growth of magnetic properties of the powders and the change of crystal orientations into amorphous state. FREE TERMS: High energy ball milling, Crystal structure ABSTRAK ANALISIS DIFRAKSI SINAR-X TERHADAP PEMADUAN MEKANIK PADA PEMBENTUKAN Mg2Ni. Sintesa dan karakterisasi logam paduan Mg2Ni yang dibuat dengan teknik pemaduan mekanik telah dilakukan. Bahan paduan di-milling dengan waktu milling bervariasi yakni 20, 25, 30, 35 dan 40 jam. Hasil pengukuran dengan menggunakan difraktometer sinar-X menunjukkan bahwa hasil pengolahan data atas hasil cacah difraktometer sinar-X sangat sesuai dengan hasil observasi. Hasil olahan menunjukkan bahwa spesimen terdiri dari tiga fasa, yaitu Mg2Ni, MgO dan MgNi2. Untuk waktu milling antara 20 dan 25 jam, fraksi massa fasa Mg2Ni bertambah dari 42,19% menjadi 51,03%. Milling lanjutan hingga 40 jam akan mereduksi fraksi massa fasa Mg2Ni menjadi 11,86%. Hal ini mungkin disebabkan adanya oksigen di dalam mesin milling, dan sebagai konsekuensinya akan menambah fraksi massa fasa MgNi2. Disimpulkan bahwa waktu milling mempengaruhi pembentukan senyawa Mg2Ni. Pada penelitian ini, waktu milling selama 25 jam adalah waktu terbaik untuk pembentukan fasa senyawa Mg2Ni. Analisa mikrostruktur atas spesimen menunjukkan bahwa waktu milling 30 jam adalah waktu minimum yang diperlukan untuk mereduksi ukuran partikel dari 3,5~10 tm menjadi partikel ukuran nano. Setelah milling selama 40 jam spesimen mulai menggumpal yang disebabkan oleh tumbuhnya sifat magnet serbuk dan terjadinya perubahan orientasi kristal menjadi amorf.KATA KUNCI: High energy ball milling, Struktur kristal
PREPARASI NANOKRISTALIN HIDROKSIAPATIT UNTUK SCAFFOLD REKAYASA JARINGAN TULANG Indrani, Decky J.; Adi, Wisnu Ari
Jurnal Sains Materi Indonesia 2012: Desember 2012
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Telah dilakukan sintesis dan karakterisasi nanopartikel Hidroksiapatit (HA)menggunakan metode presipitasi. Hasil pencampuran serbuk Ca(OH)2 dan cairan H3PO4 dengan perbandingan mol sebesar 10 : 6 selanjutnya dikalsinasi pada suhu bervariasi sampai dengan 900 oC masing-masing selama 3 jam. Hasil refinement pola difraksi sinar-X menunjukkan bahwa hidroksiapatit hasil sintesis dengan berbagai suhu kalsinasi merupakan fasa tunggal Ca10(PO4)6(OH)2 yang memiliki struktur heksagonal (P63/m). Berdasarkan hasil refinement diperoleh bahwa seiring dengan semakin rendahnya suhu kalsinasi HA maka diperoleh volume, kerapatan atomik dan derajat kristalinitas yang semakin menurun dan ukuran kristalit yang semakin kecil. Disimpulkan bahwa pada suhu kalsinasi HA hasil sintesis terendah, maka diperoleh volume, kerapatan atomik dan derajat kristalinitas paling rendah dengan ukuran kristalit paling kecil.
SYNTHESIS OF MAGNETIC MATERIALS PSEUDOBROOKITE Fe2TiO5 FROM LOCAL RESOURCES OF MINERAL Sardjono, Prijo; Adi, Wisnu Ari; ., Sudirman
Jurnal Sains Materi Indonesia Vol 14, No 3 (2013): April 2013
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The synthesis and characterization of magnetic materials pseudobrookite Fe2TiO5 from local resources of iron sand has been performed. Iron sand mineral is obtained from the coast of Banten. Iron sand is prepared by mechanical milling technique to obtain a small particle size. Then sand iron is carried out leaching and magnetic seperator to separates non-magnetic impurities. And then the separation results with magnetic separator is added TiO2 according to the rules of stoichiometric tomade magneticmaterial pseudobrookite Fe2TiO5. Synthesis of pseudobrookite Fe2TiO5 use solid state reaction through a process of mechanical milling and sintered at a temperature of 1000 °C for 5 hours. Refinement results of X-Ray Diffraction pattern showed that the magnetic material pseudobrookite Fe2TiO5 has been formed of good with the crystal structure of orthorombic (space group C m c m), lattice parameters a = 3.7233(5) Å, b = 9.774(1) Å and c = 9.968(1) Å, α = β = γ = 90o, the unit cell volume of V = 362.8(1) Å3 and atomic density of ρ = 4.178 g.cm-3. The measurement results of the magnetic properties indicate that the pseudobrookite Fe2TiO5 is soft magnet, and had coercivity field and remanence magnetization are 461 Oe and 0.2 emu/g, respectively. We concluded that this study has successfully made a magnetic material pseudobrookite Fe2TiO5 from local resources of iron sands.Keywords: Iron sand, Magnet, Pseudobrookite, Fe2TiO5, Crystal structure, Microstructure
THE EFFECT OF Cu DOPING ON CRYSTAL STRUCTURE AND MAGNETORESISTANCE IN La0.73Ca0.27Mn1-yCuyO3 WITH 0 < y < 0.19 Gunanto, Y. E.; Kurniawan, B.; Purwanto, A.; Adi, Wisnu Ari; Poertadji, S.
Jurnal Sains Materi Indonesia Vol 14, No 3 (2013): April 2013
Publisher : BATAN

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We studied the crystal structure at room temperature and low temperature, as well as the magnetoresistance as a function magnetic field at room temperature in the compound La0.73Ca0.27Mn1-yCuyO3 with 0 &lt; y &lt; 0.19. To analyze the crystal structure we used X-Ray Diffractometer (XRD) at room temperature and the neutron-powder-diffraction at room temperature and low temperatures. The neutron powder diffraction experiments were under taken with the High Resolution Powder Diffractometer (HRPD) (λ=1.8223 Å) at the Neutron Scattering Center of BATAN using the fullprof program. To analyze the magnetoresistance, we used a four point probe aparatus in the range ofmagnetic fields 0-7600 Oersted. We have found that no change in crystal structure despite of increasing value of y. All samples have structure orthorhombic with space group P nma, but the volume of lattice in low temperature is smaller than room temperature. At room temperature, increasing the value y impact declining value of magnetoresistance.Keywords: Crystal structure, HRPD, Fullprof program, Magnetoresistance
THE EFECT OF CALCINATION TEMPERATURE ON TOXIN ADSORPTION MATERIALS FOR DIARRHEAL DISEASES Primandini, Priska; Hasanah, Aliya Nur; Adi, Wisnu Ari; Budianto, Emil; ., Sudirman
Jurnal Sains Materi Indonesia Vol 13, No 3 (2012): Juni 2012
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The synthesis and characterization of kaolin as a toxin adsorption material for diarrheal diseases has been performed. Adsorption ability is one important factor in determining the effectiveness of the adsorbent. Each adsorbent has different strengths depending on the adsorption capacity of each. The kaolin has been calcined at 400 °C, 600 °C, and 800 °C. The purpose of this study was to examine the changing character of the kaolin after calcination on the adsorption capacity. The characterization of samples includes the analysis phase, density test, porosity test, and the adsorption test of metal timbale as a medium toxin. We concluded that the kaolin has the highest adsorption capability level is a kaolin has been calcined at 400 °C with characteristic are kaolinite phase containing, degree of crystallinity of 76.59 %, has a density of 2.6275 g/ mL, the optimum porosity of 75 %, and the adsorption capacity of lead metal of 99.7325 %. The adsorption capacity of kaolin have been calcined at 400 °C is much better than the kaolin without calcinations and expected to be more effectively used to cure diarrhea.Keywords: Kaolin, Calcination, Phase, Density, Porosity, Adsorption.
THE ANALYSIS OF PHASE AND MICROSTRUCTURE ON THE TAPIOCA THROUGH NATRIUM METABISULFITE ADDITION ., Husniati; Adi, Wisnu Ari
Jurnal Sains Materi Indonesia Vol 13, No 2 (2012): Februari 2012
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The addition of Natrium metabisulfite (Na2S2O5) in the tapioca with purpose to increase whiteness degree suitable to SNI 01-3729-1995 for small industries has been performed. The result of whiteness degree determination are 90.3 %; 91.8 %; 94.9 %; 95.7 % and 96.2 % with 0 %; 0.1 %; 0.2 %; 0.5 % and 1.0 % Na2S2O5 addition, respectively. The refinement result of X-ray diffraction profile showed that the tapioca consist of two phases, namely α-Amylose and β-D-Glucose. The observation result of scanning electron microscope showed that the tapioca with 0.2 % Na2S2O5 addition has dominated white color and the particle distribution was very uniform. We concluded that the Na2S2O5 can increase phase of β-D-Glucose so that able to prevent browning reaction in the tapioca.Keywords: Tapioca, Whiteness degree, Natrium metabisulfite.
PHASE ANALYSIS AND MAGNETIC PROPERTIES OF BaFe12O19/Nd2Fe14B COMPOSITE BY MECHANICAL MILLING PRODUCT Sardjono, Prijo; Adi, Wisnu Ari; Sebayang, Perdamaian; ., Muljadi
Jurnal Sains Materi Indonesia Vol 13, No 2 (2012): Februari 2012
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The synthesis and characterization of BaFe12O19/Nd2Fe14B composite by use mechanical milling has been performed. The result of refinement of X-ray diffractions showed that the sample consist of two phases namely BaFe12O19 and Nd2Fe14B phase with fraction mass were 79.89 and 20.11 wt%, respectively. The BaFe12O19 system magnetic materials have been formed with the crystal structure of hexagonal (space group P 63/m m c), lattice parameter are a = 5.9033(5) Å, b = 5. 9033(5) Å and c = 23.239(2) Å, α = β = 90o and γ = 120o, V = 701.3(1) Å3 and ρ = 5.7172 g.cm-3. The Nd2Fe14B system magnetic materials have been formed with the crystal structure of tetragonal (space group P 42/m n m), lattice parameter are a = 8.865(8) Å, b = 8.865(8) Å and c = 12.269(1) Å, α = β = γ = 90o, V = 964.3(1) Å3 and ρ = 7.7508 g.cm-3. The magnetic properties result of Nd2Fe14B shown that the sample has the coercive field and remanence magnetization are 7984 Oe and 5250 Gauss, respectively. The BaFe12O19 are 1625 Oe and 1190 Gauss, respectively. And the BaFe12O19- Nd2Fe14B composite increase to become 2650 Oe and 1580 Gauss, respectively. We conclude that the process of mixing between BaFe12O19 and Nd2Fe14B is not affect the change of each phase. The BaFe12O19 particle can be use as the shielding of the Nd2Fe14B particle from it’s the corrosion properties. The BaFe12O19 magnetic material has a stable structure at room temperature, so that this structure was not easy of change after mix with the Nd2Fe14B particles.Keywords: BaFe12O19/Nd2Fe14B, Mechanical milling, Crystal structure, Magnetic properties.
Co-Authors A Purwanto A. Purwanto Abdullah Abdullah Adel Fisli Adnyana, I Gusti Agung Putra AGUS PURWANTO Agus Sukarto Wismogroho, Agus Sukarto Ahmad S., Ahmad Akmal Johan, Akmal Aliya Nur Hasanah Andika Fajar Andon Insani Ari Handayani Azwar Manaf B. Kurniawan Budhy Kurniawan Decky J. Indrani Delina, Mutia Deswita Deswita Didin S. Winatapura Didin Sahidin Winatapura E. Sukirman Emil Budianto Engkir Sukirman Eric Jobiliong Fauzy, Rizky Grace Tj. S. Grace Tj. Sulungbudi Gunanto, Y E H. Tanaka Hadi Suwarno Husniati . Husniati Husniati, Husniati Iwan Setiawan Jalut, Laura Laudensia Senly Karo Karo, Pulung Kodir, Dudung Abdul Komang Ngurah Suarbawa Kurniawan, B M., M. Refai Mashadi Mashadi Moh. Toifur Mugihardjo, Herry Mujamilah Mujamilah Muljadi . Muljadi Muljadi Mulyawan, Ade Muslih, M. Rifai Nenni, Nenni Noviyanto, Alfian Nurmaya Arofah, Nurmaya Nurul Taufiqu Rochman Octavianus Octavianus, Octavianus P. Purwanto P., Yustinus P., Yustinus M. Perdamaian Sebayang Perdamean Sebayang Pius Sebleku Poertadji, S Prijo Sardjono Priska Primandini Purwani, M V Purwatamanggala, Yustinus Purwatamanggalapratala, Yustinus Rachmawati, Indri Ridwan Ridwan Ryan Rizaldy S. Poertadji S. Purwanto Safei Purnama Salim Mustofa Saptari, Sitti Ahmiatri Sari Hasnah Dewi Setyo Purwanto Siradj, Eddy S. Siregar, Riswal H. Siti Nurfadilah Siti Wardiyati Sri Mulyaningsih Sudirman . Sudirman Sudirman Suharno Suharno Sujatmoko, Sujatmoko Sulistioso Giat Sukaryo, Sulistioso Giat Surya P.P, Teguh Yulis Suyanti Suyanti Syahbani, Erwa T. Ono Taryana, Yana Taryana, Yana Tria Madesa W, Didin Sahidin W. Nursiyanto Wagiyo Wagiyo Wahyuadi, Johny Wandira, Intan Wardani, Ni Nyoman Susi Kesuma Y. E. Gunanto Yamaguchi, Y. Yasuo Yamaguchi Yohanes Edi Gunanto, Yohanes Edi Yosef Sarwanto yunasfi yunasfi Yunasfi, Yunasfi - Yusmaniar, Y. Yustinus Purwamargapratala