Syoni Soepriyanto
2Department of Metallurgical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132

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Doping Calcia and Yttria into Zirconia Obtained from by Product of Tin Concentrator to Improve its Ionic Conductivity Rahmawati, Fitria; Prijamboedi, Bambang; Soepriyanto, Syoni; Ismu, Ismunandar
Journal of Mathematical and Fundamental Sciences Vol 43, No 1 (2011)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (357.199 KB) | DOI: 10.5614/itbj.sci.2011.43.1.2

Abstract

Zirconia has been prepared from Zircon concentrate by caustic fusion methods. Zircon is a by product from tin ore concentration plant at Bangka island of Indonesia. Yttria Stabilized-Zirconia (YSZ) was prepared by introducing the 8 % mol yttrium oxide into zirconia and sintered at 1500 „aC for 5 hours. In order to obtain constant oxygen vacancy of 8 % mol in Zirconia, an appropriate amount of Yttria and Calcia were introduced into Zirconia and the mixtures were heated at 1350 oC for 5 hours. Elemental composition was determined by SEM/EDX and XRF and lattice parameters were determined using X-ray diffraction method. Ionic conductivity was measured by complex impedance spectroscopy. The results show that doping of Yttria into Zirconia (YSZ) and Calcia-Yttria into Zirconia (CYZ) allows phase transformation of Zirconia from tetragonal with space group P42/nmc into cubic Fm3m and enhance the ionic conductivity. However, the prepared materials are porous and have not met the requirement for the electrolyte material yet.
TEKSTUR DEFORMASI DAN REKRISTALISASI BAJA LEMBARAN CANAI DINGIN BEBAS INTERSTISI Korda, Akhmad A.; Muda, Iskandar; Soepriyanto, Syoni
Jurnal Sains Materi Indonesia Vol 15, No 2: JANUARI 2014
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1652.296 KB) | DOI: 10.17146/jsmi.2014.15.2.4357

Abstract

TEKSTUR DEFORMASI DAN REKRISTALISASI BAJA LEMBARAN CANAI DINGIN BEBAS INTERSTISI. Perkembangan tekstur kristalografi dipelajari pada baja lembaran bebas interstisi canai dingin. Tekstur yang diamati adalah tekstur deformasi setelah pencanaian dingin dan tekstur rekristalisasi atau tekstur annealing setelah proses annealing. Tekstur deformasi baja lembaran bebas interstisi dipelajarimelalui variasi persen reduksi ketebalan dengan selang reduksi antara 50,5% hingga 90 %. Sementara tekstur rekristalisasi dipelajari melalui variasi laju pemanasan annealing antara 32 oC/jam hingga 128 oC/jam, variasi waktu penahanan annealing antara 5 jam hingga 20 jam dan variasi suhu annealing dari 700 oC hingga 900 oC. Perkembangan tekstur deformasi dan rekristalisasi dipelajari melalui pengujian difraksi sinar-X. Tekstur kristalografi diukur untuk tekstur yang mempengaruhi sifat mampu bentuk, yaitu tekstur [111] dan tekstur [100]. Pengujian tarik terhadap spesimen pada orientasi yang berbeda terhadap arah pencanaian kemudian dilakukan untuk memperoleh nilai r yang merupakan parameter sifat mampu bentuk baja lembaran.
SYNTHESIS AND CHARACTERIZATION OF CERAMIC METAL Ni-YSZ PREPARED FROM LOCAL ZIRCON SAND AT VARIOUS Ni:YSZ COMPOSITION Apriany, Karima; Rahmawati, Fitria; Heraldy, Eddy; Syarif, Dani G; Soepriyanto, Syoni
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.2.2384.217-229

Abstract

This research synthesized a cermet Ni-YSZ, in which the YSZ (yttria stabilized-zirconia) was synthesized from the local zircon sand, ZrSiO4, as a side product of tin mining plant in Bangka island, Indonesia. The synthesized YSZ in this research is zirconia, ZrO2 doped by 8 % mol of yttrium dioxide. The synthesis used solid state reaction method and the result was characterized its crystal structure and its cell parameters by XRD analysis equipped with Le Bail refinement, surface morphology analysis, and an impedance analysis to understand its ionic conductivity. The cermet Ni-YSZ was synthesized at a various composition of Ni:YSZ i.e., 20:80, 30:70, and 40:60 (b/b). The analysis shows that Ni-YSZ is in two phases of Ni and YSZ without any presence of a third phase. It indicates that there was no solid state reaction between Ni and YSZ during synthesis. In this Ni-YSZ cermet, the Ni phase in a cubic structure, and the YSZ is also in a cubic structure. Morphological study shows that the addition of Ni to YSZ allows the morphology to become more roughness with larger grain size. This research found that the Ni-YSZ 20:80 has highest ionic conductivity.
PENGARUH KONSENTRASI TEMBAGA DAN RAPAT ARUS TERHADAP MORFOLOGI ENDAPAN ELEKTRODEPOSISI TEMBAGA Wahyudi, Soleh; Soepriyanto, Syoni; Mubarok, M. Zaki; Sutarno, Sutarno
ENSAINS JOURNAL Vol 2, No 3 (2019): ENSAINS Journal September 2019
Publisher : UNIVERSITAS KEBANGSAAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31848/ensains.v2i3.295

Abstract

Abstract:. Copper deposits have been obtained by the electrolysis method using copper sulfate and sulfuric acid. The effect of copper concentration and current density on the surface morphology of copper deposits and current efficiency have been studied. The variation of copper concentration is 0.04 M and 0.8 M and the variation of current density is 2-8 A/dm2. The copper deposits will be photographed macro, weighed and characterized by Scanning Electron Microscope (SEM) to determine the surface morphology of deposits and Energy-Dispersive X-ray spectroscopy (EDX) to determine the chemical composition of deposits. The surface morphology of copper deposits in the form of compact and without nodules was reached at copper concentration is 0.8 M and the current density is 2 A/dm2 with the average of current efficiency is 96%.Keyword: Electrodeposition, copper, morphology, compact, current efficiency Abstrak: Endapan tembaga telah dihasilkan dengan metode elektrolisis menggunakan bahan tembaga sulfat dan asam sulfat. Penelitian ini mempelajari pengaruh konsentrasi tembaga dan rapat arus terhadap morfologi permukaan endapan tembaga dan efisiensi arus. Variasi konsentrasi tembaga adalah 0,04 M dan 0,8 M sedangkan variasi rapat arus adalah 2-8 A/dm2. Endapan tembaga yang dihasilkan akan difoto makro, ditimbang berat lapisannya dan diuji karakteristiknya dengan Scanning Electron Microscope (SEM) untuk mengetahui detail morfologi permukaan endapan dan Energy-Dispersive X-ray spectroscopy (EDX) untuk mengetahui komposisi kimia endapan. Morfologi permukaan endapan tembaga berbentuk compact dan tanpa nodul tercapai pada kondisi konsentrasi Cu 0,8 M dan rapat arus 2 A/dm2 dengan efisiensi arus mencapai rata-rata 96%.Kata Kunci: Elektrodeposisi, tembaga, morfologi, compact, efisiensi arus
SINTESIS DAN KARAKTERISASI FERIT GELOMBANG MIKRO YIG DISUBSTITUSIKAN DENGAN ION Al, Gd Sudjono, Hans K.; Soepriyanto, Syoni; Muljadi, Muljadi
Jurnal Sains Materi Indonesia Vol 2, No 1: OKTOBER 2000
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.2 KB) | DOI: 10.17146/jsmi.2000.2.1.4906

Abstract

SINTESIS DAN KARAKTERISASI FERIT GELOMBANG MIKRO YIG DISUBSTITUSIKAN DENGAN ION Al, Gd. Telah disintesis ferit untuk kompunen gelombang mikro dari bahan garnet (YIG) yang disubstitusikan dengan Al dan Gd, permeabilitas dan polarisasi magnet berubah dengan penambahan kadar ion Al3+. Pengujian XRD dilakukan untuk menentukan hasil proses proses sintering pada berbagai suhu. Untuk beberapa cuplikan diuji sifat magnetnya dan juga sifat kinerja pada daerah microware dengan dibentuk sirkurator lengkap yang memberikan data parameter, isolasi insertion-loss, diuji dengan Circuit Analyzer gelombang micro (1-8 Ghz). Insertion loss pada umumnya masih terlalu besar karena porositasnya masih terlalu tinggi, jadi perlu perbaikan dalam proses sintesanya.
ANALISIS LAJU DEGRADASI RHODAMINE B (RhB) PADA PROSES FOTOKATALISIS TiO2 Aristanti, Yesi; Minandar, Nurahmah; Marliani, Marliani; Soepriyanto, Syoni
ENSAINS JOURNAL Vol 2, No 3 (2019): ENSAINS Journal September 2019
Publisher : UNIVERSITAS KEBANGSAAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31848/ensains.v2i3.293

Abstract

Abstract:. The photocatalysis of TiO2 process occurs due to electrons transition in the valence band are excited to the conduction band when light hitting of TiO2 surface having greater energy than the bandgap energy. Rhodamine B (RhB) as a test solution is used to measure the degradation rate and photocatalytic efficiency of Anatase TiO2 (TiO2 A), mixture of Anatase and Rutile TiO2 (TiO2 Ar), Merck Anatase TiO2 (TiO2 M) and mixture of Merck and Rutile Anatase TiO2 (TiO2 Mr). The variables used were solid percent TiO2 (0%; 0.1%; 0.2%; 0.3% and 0.4%), the concentration of the test solution (5, 10, 15, 20 and 25 ppm) and the solar radiation time (30, 60, 90, 120 and 150 minutes). The results got showed that TiO2 A had the highest degradation rate among other TiO2 of 0.0087/minute and the highest photocatalysis efficiency was TiO2 M at 75% solid variable, TiO2 A at a variable concentration of test solution and radiation time respectively 83% and 71%.Keyword: TiO2, photocatalysis, rhodamine B.Abstrak: Proses fotokatalisis TiO2 terjadi karena elektron yang berada pada pita valensi tereksitasi ke pita konduksi akibat dari cahaya yang mengenai permukaan TiO2 memiliki energi lebih besar dibandingkan energi celah pitanya. Rhodamine B (RhB) digunakan sebagai larutan uji untuk mengukur laju degradasi dan efisiensi fotokatalisis TiO2 Anatase (TiO2 A), TiO2 campuran Anatase dan Rutile (TiO2 Ar), TiO2 Anatase Merck (TiO2 M) dan TiO2 campuran Anatase Merck dan Rutile (TiO2 Mr). Variabel yang digunakan adalah persen solid TiO2 (0%; 0,1%; 0,2%; 0,3% dan 0,4%) konsentrasi larutan uji (5, 10, 15, 20 dan 25 ppm) serta waktu radiasi matahari (30, 60, 90, 120 dan 150 menit). Hasil yang diperoleh menunjukkan bahwa TiO2 A memiliki laju degradasi paling tinggi diantara TiO2 lainnya sebesar 0,0087/menit dan efisiensi fotokatalisis tertinggi yakni TiO2 M pada peubah persen solid sebesar 75%, TiO2 A pada peubah konsentrasi larutan uji dan waktu radiasi masing-masing sebesar 83% dan 71%.Kata Kunci: TiO2, fotokatalisis, rhodamin B.
Pengaruh Penambahan CuO Sebagai Sintering Aid pada Elektrolit Padat Neodymium Doped Ceria (NDC) Arifiadi, Anindityo Anindityo; Soepriyanto, Syoni
Jurnal Metalurgi dan Material Indonesia Vol 2 No 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (10.055 KB)

Abstract

In this research, NDC powder with a chemical formula of Ce0,75Nd0,25O1,875 added with 0, 0,5, 1, ad 1,5 wt% CuO is synthesized. Powder is mixed by stirring at an ethanol medium. Mixed powder is compacted to form a pellet and then sintered at 1000oC, 1200oC, and 1400oC for 4 hours. Sintering time variation of 2, 3, and 4 hours is also performed at 1200oC. Result shows that the highest relative density of 65,21% is achieved by 0,5wt% CuO addition sintered at 1200oC for 4 hours. Without CuO addition, pellet shrink through grain boundary diffusion and with CuO addition, liquid phase sintering occurs. Electrochemical impedance analysis shows that CuO lowers grain boundary resistance. The highest conductivity (1,52 x 10-2 S/cm) at 700oC with an activation energy of 0,85 eV is achieved by pellet added with 0,5 wt% CuO.
UTILISATION OF SLAG POWDER FOR CEMENT SUBSTITUTION BASED ON THE COMPRESSIVE STRENGTH AND PENETRATION OF CHLORIDE IONS Amalia, Yasmina; Soepriyanto, Syoni
Jurnal Sains Materi Indonesia Vol 20, No 2: JANUARY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (869.977 KB) | DOI: 10.17146/jusami.2019.20.2.5446

Abstract

UTILIZATION OF SLAG POWDER FOR CEMENT SUBSTITUTION BASED ON THE COMPRESSIVE STRENGTH AND PENETRATION OF CHLORIDE IONS. The availability of waste from nickel ore smelting in the form of slag has increased, this is due to the high nickel production to meet the increasing needs for development and for compound- ing materials for construction materials. This research aims to make a paste from the mixture of Nickel Pig Iron (NPI) slag from PT Indoferro which is used as a substitute for making cement paste. The materials used in this study are cement, nickel slag, water, and zeolite. The cement paste is made with a dimension of 10 cm x 5 cm with each slag used as an amplifier on the paste with a volume variation of 15%, 30%, 45%, and 60%. Each material is weighed according to mix design then mixing the materials, after they are homogeneous, they are put into the mold and then let stand for 24 hours until the paste solidifies and hardens, after 24 hours, the paste sample is removed from the mold and treated at room temperature, after the life is qualified, the paste sample is tested. Results of the compression test show that variations of slag addition to the paste mixture giving maximum compressive strength is the 15% variant for NPI slag. The increase in compressive strength of the slag mixture paste may occur because slag contains cement compounds which can chemically react with Calcium Hydroxide (CH) com- pounds as a result of the hydration reaction of cement with water to form a Calcium Silicate Hydrate (CSH) compound from the hydration result between water and cement to increase adhesion and compressive strength on cement paste.