Article Per Year (5 Year)
p-Index From 2021 - 2026
0.778
P-Index
This Author published in this journals
All Journal Jurnal Ilmu Dasar Jurnal Sains Materi Indonesia Jurnal Kimia dan Kemasan MESIN Science and Technology Indonesia Metalurgi Indonesian Physical Review Makara Journal of Science Jurnal Polimesin Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Wisnu Ari Adi
Pusat Teknologi Bahan Industri Nuklir, BATAN Kawasan Puspiptek, Serpong 15314, Tangerang Selatan
Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

Published : 13 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 13 Documents
Search

 1   2 
THE EFFECT OF BARIUM SUBSTITUTION WITH COMBINATIONS OF RARE EARTH ON PERMANENT MAGNETIC SURFACE MORPHOLOGY BASED ON BARIUM HEXAFERRITE Adnyana, I Gusti Agung Putra; Suarbawa, Komang Ngurah; Nurmalasari, Ni Putu Yuni; Adi, Wisnu Ari
Indonesian Physical Review Vol. 7 No. 2 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i2.300

Abstract

The development of hard magnets today is progressing very rapidly. Developing hard magnets based on rare earth metals becomes a severe problem when the raw materials are not readily available. The chosen solution is to replace oxide-based permanent magnets with small amounts of rare earth metals substituted to improve their magnetic properties. This study synthesized a permanent magnet oxide based on barium hexaferrite doped with lanthanum and cerium atoms. In the synthesis of this material, a mechanical wet milling technique is used to obtain a single-phase permanent magnetic Ba1-β-γLaβCeγFe12O19 system with composition (β = 0 - 0.5 and γ = 0 - 0.1). The precursors are weighted according to their stoichiometric composition. Each mixed composition was milled by high energy milling (PW 1000 in the mixer/mill) at a milling speed of 1000 rpm using steel balls with an average diameter of 12 mm. Grinding conditions included a ball-to-powder weight ratio of 2:1, milling time 5 hours, then compacted with 7000 Psi pressure and sintered at 1200oC for 2 hours. The surface morphology and microstructure of the resulting sample particles were observed using scanning electron microscopy (SEM) with the SEM JEOL JED 305 brand. The characterization results show that the particles are hexagonally homogeneous in shape with particle sizes in the range of 1000-2000 nm for β = 0 and γ = 0 (without doping). In general, the four samples with varying concentrations of doping ions La3+ and Ce4+ showed homogeneous hexagonal structures but smaller particle sizes than pure barium hexaferrite. The sample particle sizes ranged from 500-1000 nm for β = 0.02 and 300-1000 nm for β = 0.04.
Studi Fasa dan Sifat Termal Lantanum Oksida Berbasis Monasit Dewi, Sari Hasnah; Adi, Wisnu Ari; Suyanti
EKSPLORIUM Vol. 40 No. 2 (2019): NOVEMBER 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.2.5646

Abstract

Rare earth elements (REE) in Indonesia have great potency, mainly from monazite mineral. Monazite is a combination of REE-U/Th-phosphate elements which is associated with tin deposit and radioactive elements. Through BATAN incorporated program, monazite mineral is processed to become more economically valuable materials. Lanthanum (La) is a metal element, part of REE group, which has excellent properties for pigment and electromagnetic absorber. The purpose of this study is to obtain information related to the effect of calcination in high temperature on the product of monazite’s REE hydroxide (RE(OH)3) processing pilot plant, specific on La2(C4O4)3 for Certified Reference Material (CRM) La­2O3 making. The weighed material is calcined on combustion boat by using a furnace at heating temperature of 1,000 OC and 1,300 OC. Thermal decomposition is analyzed by using Thermogravimetric analysis (TGA). Material phase formation is analyzed by using X-Ray Diffraction (XRD) method. XRD analysis shows the material in final phase has been transform to 28.76 % La2O3 and 71.24 % La(OH)3.
Effect of Niobium Addition on Corrosion Behavior, Mechanical Properties, and Microstructures of U6Zr Alloys in an Aerated Environment Masrukan, Masrukan; Handoko, Djati; Djuhana, Dede; Sigit, Rohmad; Al Hasa, M. Husna; Adi, Wisnu Ari; Mardiah, Siti
Makara Journal of Science Vol. 29, No. 4
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The effect of Nb addition on the corrosion behavior of U–6Zr alloys within an aerated, demineralized water (DW) environment (pH 5.61) and its correlation of this addition with the mechanical and microstructural properties of the alloys were investigated. The U–6Zr–xNb alloys (x = 1, 4, and 7 wt.%) were synthesized by arc-melting U, Zr, and Nb. Additionally, the samples were mounted and polished, after which they were subjected to electrochemical corrosion analysis using a potentiostat. This evaluation was conducted in a DW medium (pH 5.6), representing an aerated atmosphere, at room temperature (27°C) and a potentiodynamic scan rate of 1 mV/cm2. The results demonstrate that Nb addition to the U–6Zr alloy, which yielded a U–6Zr–xNb (x = 1.4 and 7 wt.%) alloy, influenced the corrosion behavior in media, exhibiting a slightly acidic pH (5.61). Nb additions of up to 4 wt.% caused a continuous increase in the open-circuit potential, corrosion-current density, and corrosion rate (CR); however, these values decreased with the continuous increase in Nb concentrations to 7 wt.%. Furthermore, microstructural analysis via scanning electron microscopy and energy-dispersive X-ray spectroscopy revealed that the corrosion products across almost all U–6Zr–xNb test samples (x = 0, 1, 4, and 7 wt.%) were primarily stable uranium dioxide, which formed a protective layer, followed by oxynitride and zirconium(IV) oxide.Overall, the findings indicated that the varying Nb contents (1, 4, and 7 wt.%) dictated the CR, mechanical properties, and microstructure of the alloys. Ultimately, this study demonstrates the synthesis of U–6Zr–xNb alloys (x = 0, 1, 4, and 7 wt.%) with enhanced performance characteristics.
Co-Authors Adi Ganda Putra Adnyana, I Gusti Agung Putra Azwar Manaf Budhy Kurniawan Dede Djuhana Deswita Deswita Didin S. Winatapura Didin Sahidin Winatapura Engkir Sukirman Fauzy, Rizky Grace Tj. Sulungbudi Handoko, Djati Jalut, Laura Laudensia Senly Januar Widakdo Komang Ngurah Suarbawa M. Husna Al Hasa Mashadi Mashadi Masno Ginting Masrukan Masrukan Mulyawan, Ade Naibaho, Marzuki Nehan, Phahul Zhemas Zul Novita Nurmalasari, Ni Putu Yuni Nurmaya Arofah Pius Sebleku Rachmawati, Indri Ramlan Sari Hasnah Dewi Sigit, Rohmad Siti Mardiah, Siti Siti Wardiyati Sukarasa, I Ketut Sukmara, Sony Sulistioso Giat Sukaryo, Sulistioso Giat Suyanti Taryana, Yana Vitayaya, Okvarahireka Wardani, Ni Nyoman Susi Kesuma yunasfi yunasfi Yunasfi, Yunasfi - Yusmaniar, Y. Yustinus Purwamargapratala