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All Journal Rekayasa Mesin Journal of Physics: Theories and Applications Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika
Arif Tjahjono
UIN Syarif Hidayatullah Jakarta
Education Materials Science & Nanotechnology Mechanical Engineering Physics

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Analysis Perovskite Material Absorber Based on Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 (x = 0, 0.1, 0.2) by Sol-Gel Method Fajar Arif Kurniawan; Sitti Ahmiatri Saptari; Arif Tjahjono; Deni Shidqi Khaerudini
Journal of Physics: Theories and Applications Vol 6, No 1 (2022): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v6i1.59122

Abstract

The purposes of this research is to synthesis Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 (x = 0. 0.1, 0.2) materials as electromagnetic wave absorber using the sol-gel method. Materials characterized using X-Ray Diffraction (XRD) to determine the phase formed and Vector Network Analyzer (VNA) to determine the ability or strength of absorption of electromagnetic waves. The result of  XRD material has a structure orthorhombic with space group P b n m (62-3), the substitution of Mn+3 ions on Fe+3 ions and Ti+4 ions causes a phase change of the material from when x  =0 in the absence of Mn+3 ions 2 phases are formed, while when Mn+3 is substituted 1 phase is formed. The result of VNA with a frequency range of 8 – 12 GHz shows that the material has the ability to absorb electromagnetic waves up to 98,22% at a frequency of 9,5 GHz when x = 0.2. Thus, the material synthesis Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 has been successfully synthesized and has the ability to absorb electromagnetic waves.
Sintesis Graphene Oxide (GO) berbasis arang dengan metode liquid phase exfoliation (LPE) Zahra Izzati Aziz; Arif Tjahjono
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 5 No 2 (2022): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2022.5.2.5488

Abstract

Telah dilakukan penelitian tentang sintesis graphene oxide (GO) berbasis arang menggunakan metode Liquid Phase Exfoliation (LPE) dengan blender selama 3 jam dan surfaktan berupa sabun cuci piring sebanyak 0,75 ml untuk mengeksfoliasi lapisan karbon. Terdapat tiga jenis arang yang digunakan, yaitu arang kayu jati, arang tempurung kelapa, dan isi pensil karbon 8B yang ada di pasaran. Hasil sintesis dikarakterisasi menggunakan spektroskopi energy-dispersive X-ray (EDX), spektrofotometer UV-Vis, dan spektroskopi Raman. Hasil karakterisasi EDX menunjukkan bahwa kandungan unsur karbon (C) paling optimum terdapat pada arang kayu jati dengan nilai 90,15 Mass% atau 92,88 At%. Hasil karakterisasi UV-Vis menunjukkan bahwa ketiga sampel telah memiliki panjang gelombang yang sesuai dengan panjang gelombang GO, yaitu 220 nm – 270 nm. Hasil karakterisasi Raman menunjukkan bahwa impuritas ketiga sampel masih cukup tinggi yang ditandai dengan intensitas puncak D yang lebih tinggi dibandingkan puncak G, hal ini tidak lepas dari kualitas arang yang digunakan. Lapisan yang dihasilkan dari ketiga sampel berupa multilayer. Berdasarkan perhitungan nilai energi celah pita menggunakan metode Tauc Plot diketahui bahwa ketiga sampel berada dalam rentang material semikonduktor dengan nilai energi celah pita terkecil yaitu arang kayu jati sebesar 3,23 eV.
PENGARUH SOLUTION TREATMENT DAN MEDIA PENDINGIN PADA PROSES HOT ROLLING TERHADAP KEKUATAN BAJA MANGAN AUSTENITIK Nadya Salsabila Frendyta; Arif Tjahjono; Permana Andi Paristiawan
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1312

Abstract

A steel with high hardness but relatively low ductility and toughness is called austenitic manganese steel. This steel implementation often suffers from defect and failure. Responding to this problem, the study was done by manipulating a heat treatment process in order to change the microstructure, refine the grain, and improve its mechanical properties thereby increasing its ductility and toughness. It was begun by heating the austenitic manganese steel to austenizing temperature (1000°C) and holding for 100 minutes. The solution treatment process is carried out by a hot rolling process with a temperature of 1100 °C. Quenching process is done using water cooler and ice water as media. Temperature variation selection aimed to find out the phase change in microstructure and its effect on mechanical properties. In solution treatment process with water cooling, austenitic manganese steel indicated a significant microstructure with little martensite and more dominant in austenite and ferrite microstructure. This phenomenon gave the hardness reduction effect which in turn indicated the increase of ductility and toughness on austenitic manganese steel with high tensile and elongation test result. Therefore, austenitic manganese steel which is the result of a solution treatment process with water cooling will have a better lifetime in its implementation in industrial world.  
Co-Authors Deni Shidqi Khaerudini Fajar Arif Kurniawan Nadya Salsabila Frendyta Permana Andi Paristiawan Saptari, Sitti Ahmiatri Zahra Izzati Aziz