Article Per Year (5 Year)
p-Index From 2020 - 2025
0.92
P-Index
This Author published in this journals
All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Science and Technology Indonesia Jurnal Elektronika dan Telekomunikasi Inovasi Fisika Indonesia (IFI) Metalurgi
Nanang Sudrajat, Nanang
Pusat Penelitian Elektronika dan Telekomunikasi - LIPI
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 6 Documents
Search

 1 
Ketidakpastian Pengukuran pada Karakteristik Material Magnet Permanen dengan Alat Ukur Permagraph Kristiantoro, Tony; Idayanti, Novrita; Sudrajat, Nanang; Septiani, Ardita; Mulyadi, Dadang; -, Dedi
Jurnal Elektronika dan Telekomunikasi Vol 16, No 1 (2016)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (451.698 KB) | DOI: 10.14203/jet.v16.1-6

Abstract

Telah dilakukan perhitungan nilai ketidakpastian pengukuran pada karakteristik material magnet permanen menggunakan alat ukur Permagraph Magnet Physik Germany. Karakteristik magnet yang diukur adalah induksi remanen, Br (kG), gaya koersifitas induksi, HcB (kOe), gaya koersifitas polarisasi, HcJ (kOe), kuat medan remanen kiri, Hknee (kOe), produk energi maksimum, BHmax (MGOe), kuat medan produk energi maksimum, Ha (kOe), magnetik fluks, Ba (kG), kuat medan maksimum, Hmax (kOe). Sebelum menentukan nilai ketidakpastian dengan permagraph terlebih dahulu ditentukan nilai ketidakpastian dengan alat penunjang, yaitu jangka sorong dan neraca analitik. Selanjutnya akan didapat nilai ketidakpastian gabungan. Metoda ketidakpastian yang digunakan adalah dengan cara statistik dan berlaku hanya untuk serangkaian observasi. Penentuan nilai ketidakpastian dilakukan dengan cara melakukan pengukuran yang berulang sebanyak sepuluh kali terhadap sample yang sama. Metoda ini mengacu kepada ISO GUM dengan menggunakan evaluasi tipe A. Nilai ketidakpastian yang didapat untuk pengukuran dengan jangka sorong adalah ±0,0329 cm, neraca analitik ±0,0528 gr, dan untuk karakteristik magnet Br ±0,0648 kG, HcB ±0,0632 kOe, HcJ ±0,0628 kOe, Hknee ±0,0643 kOe, BHmax ±0,0631 MGOe, Ha ±0,1213 kOe, Ba ±0,0664 kG,Hmax ±0,0627 kOe. 
POTENSI KERAMIK Mg(Ti0,95Cr0,05)O3 SEBAGAI KANDIDAT MATERIAL DIELEKTRIK RESONATOR DRO PADA FREKUENSI 3,3 GHZ: Kata Kunci: keramik MTC005; dielektrik resonator; DRO; frekuensi resonansi; output power Akmalia, Anisa Dina; Ermawati, Frida Ulfah; Taryana, Yana; Sulaiman, Yaya; Sukoco, Bagus Edi; Sudrajat, Nanang
Inovasi Fisika Indonesia Vol. 13 No. 2 (2024): Vol 13 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v13n2.p128-137

Abstract

Keramik MgTiO3 merupakan material dengan sifat dielektrik yang baik sehingga berpotensi sebagai material dielektrik resonator (DR) yang diaplikasikan pada sistem telekomunikasi gelombang mikro. Terkait hal tersebut, makalah ini melaporkan potensi keramik dengan komposisi baru, yaitu Mg(Ti0,95Cr0,05)O3 (selanjutnya disingkat MTC005) sebagai kandidat material DR pada frekuensi 3,3 GHz. Tujuan dari makalah ini adalah untuk menganalisis karakteristik DRO keramik pada gelombang mikro berupa frekuensi resonansi dan output power (diukur menggunakan Spectrum Analyzer) dan menghubungkannya dengan data struktur, mikrostruktur, densitas bulk, dan permitivitas relatif (Er). Keramik dikompaksi menggunakan die-press berdiameter 8 mm dan hydraulic-hand-press pada tekanan 10 MPa sebelum disinter pada suhu 1300 °C selama 3 jam. Data struktur keramik diperoleh dari pola XRD Cu-Ka menunjukkan bahwa keramik MTC005 mengandung fasa utama MgTiO3 (89,34 %molar) dan sisanya adalah fasa TiO2 rutile. Kerapatan dan kepadatan butir pada permukaan keramik ini dikonfirmasi oleh nilai densitas bulk sebesar 3,63 gr.cm-3 . Selain itu, hasil uji EDX menunjukkan bahwa keramik ini mengandung bahan-bahan penyusun saja, yaitu Mg, Ti, Cr, dan O dengan rasio % atom Mg : (Ti+Cr) : O = 19,693 : 20,665 : 63,651 mendekati rasio stoikiometri idealnya, yaitu 1 : 1 : 3 . Sedangkan nilai rata-rata Er keramik MTC005 yang diukur secara kontinu pada frekuensi 2-4 GHz = 17,5. Peristiwa resonansi DRO terekam pada frekuensi 3,367 GHz dengan output power +4,52 dBm. Dengan demikian, berdasarkan semua data di atas dapat disimpulkan bahwa keramik MTC005 sangat potensial sebagai kandidat material resonator DRO pada S-band, khususnya pada frekuensi 3,3 GHz. Kata Kunci: keramik MTC005; dielektrik resonator; DRO; frekuensi resonansi; output power Abstract MgTiO3 ceramic is a material with good dielectric properties so it has potential as a dielectric resonator (DR) material applied in microwave telecommunications systems. In this regard, this paper reports the potential of ceramics with a new composition, namely Mg(Ti0.95Cr0.05)O3 (hereinafter abbreviated as MTC005) as a candidate DR material at a frequency of 3.3 GHz. The aim of this paper is to analyze the characteristics of ceramic DRO at microwaves in the form of resonance frequency and output power (measured using a Spectrum Analyzer) and relate them to data on structure, microstructure, bulk density and relative permittivity (Er). The ceramics were compacted using a die-press with a diameter of 8 mm and a hydraulichand-press at a pressure of 10 MPa before being sintered at a temperature of 1300 °C for 3 hours. Ceramic structure data obtained from the Cu-Kα XRD pattern shows that the MTC005 ceramic contains the main phase MgTiO3 (89.34% molar) and the remainder is the rutile TiO2 phase. The density and grain density on the ceramic surface is confirmed by the bulk density value of 3.63 gr.cm-3 . Apart from that, the EDX test results show that this ceramic contains only the constituent ingredients, namely Mg, Ti, Cr, and O with a atomic % ratio of Mg : (Ti+Cr) : O = 19.693 : 20.665 : 63.651 close to the ideal stoichiometric ratio. namely 1 : 1 : 3 . Meanwhile, the average value of εr for MTC005 ceramics measured continuously at a frequency of 2-4 GHz = 17.5. The DRO resonance event was recorded at a frequency of 3.367 GHz with an output power of +4.52 dBm.0.263; and 64.298 %. Meanwhile, the average value for ceramics measured in the 2-4 GHz frequency range is 17.40. The results above show that MTC002 ceramic has dielectric properties (ɛr) that support its application as a resonator material in DRO, especially the S-band region (2-4 GHz). Keywords: MTC002 ceramic, resonant frequency, output power, and DRO
KARAKTERISTIK FREKUENSI RESONANSI DAN OUTPUT POWER KERAMIK Mg(Ti0,98Cr0,02)O3 SEBAGAI MATERIAL RESONATOR PADA MODUL DIELECTRIC RESONATOR OSCILLATOR (DRO): Kata Kunci: Keramik MTC002, frekuensi resonansi, output power, dan DRO. Lestari, Emilia Dwi; Ermawati, Frida Ulfah; Taryana, Yana; Sulaiman, Yaya; Sukoco, Bagus Edi; Sudrajat, Nanang
Inovasi Fisika Indonesia Vol. 13 No. 2 (2024): Vol 13 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v13n2.p119-127

Abstract

Magnesium titanate (MgTiO3) merupakan salah satu material dielectric resonator (DR) yang potensial untuk diaplikasikan pada berbagai sistem telekomunikasi, salah satunya sebagai komponen pembangkit frekuensi resonansi pada modul dielectric resonator oscillator (DRO) untuk aplikasi sistem radar. Terkait hal tersebut, makalah ini melaporkan karakteristik frekuensi resonansi dan output power keramik Mg(Ti0,98Cr0,02)O3 (disingkat MTC002) ketika keramik tersebut diujicobakan sebagai resonator pada modul DRO. Keramik dikompaksi menggunakan uniaxial-cylindrical-die press berdiameter 8 mm dan hydraulic-handpress pada tekanan 10 MPa, serta disinter pada suhu 1200 °C selama 4 jam. Tujuannya adalah untuk mengkaji karakteristik frekuensi resonansi DRO dan output power keramik serta mengkaitkannya dengan data struktur, mikrostruktur, dan permitivitas relatif. Resonansi DRO terdeteksi pada frekuensi 3,352 GHz dengan output power +3,848 dBm. Keramik ini mengandung MgTiO3 sebagai fasa utama (81,38 %molar) dan sisanya TiO2 rutile tanpa disertai fasa sekunder MgTi2O5 atau Mg2TiO4. Permukaan keramik tampak padat dengan nilai densitas bulk 3,056 g/cm3 . Selain itu, keberadaan fasa MgTiO3 tersebut dikonfirmasi oleh data EDX yang hanya mengandung unsur Mg, Ti, Cr, dan O dengan rasio %atom masing-masing 17,608; 17,831; 0,263; dan 64,298 %. Sementara nilai rata-rata ɛr keramik yang diukur pada rentang frekuensi 2-4 GHz adalah 17,40. Hasil-hasil di atas menunjukkan bahwa keramik MTC002 memiliki sifat dielektrik (Er) yang mendukung untuk diaplikasikan sebagai material resonator pada DRO, khususnya daerah S-band (2-4 GHz). Kata Kunci: Keramik MTC002, frekuensi resonansi, output power, dan DRO. Abstract Magnesium titanate (MgTiO3) is a resonator (DR) dielectric material that has the potential to be applied in various telecommunications systems, one of which is as a resonant frequency generator component in the dielectric resonator oscillator (DRO) module for radar system applications. In this regard, this paper reports the characteristics of the resonance frequency and output power of Mg(Ti0.98Cr0.02)O3 ceramic (abbreviated as MTC002) when the ceramic was tested as a resonator in the DRO module. The ceramics were compacted using a uniaxial-cylindrical-die press with a diameter of 8 mm and a hydraulic-hand-press at a pressure of 10 MPa, and sintered at a temperature of 1200 °C for 4 hours. The aim is to study the characteristics of the DRO resonance frequency and power output of ceramics and relate them to data structure, microstructure and relative permittivity. DRO resonance was detected at a frequency of 3.352 GHz with an output power of +3.848 dBm. This ceramic contains MgTiO3 as the main phase (81.38% molar) and the remainder is rutile TiO2 without the secondary phase MgTi2O5 or Mg2TiO4. The ceramic surface appears solid with a bulk density value of 3.056 g/cm3 . In addition, the existence of the MgTiO3 phase was confirmed by EDX data which only contains the elements Mg, Ti, Cr, and O with an atomic % ratio of 17.608; each 17.831; 0.263; and 64.298 %. Meanwhile, the average value for ceramics measured in the 2-4 GHz frequency range is 17.40. The results above show that MTC002 ceramic has dielectric properties (Er) that support its application as a resonator material in DRO, especially the S-band region (2-4 GHz). Keywords: MTC002 ceramic, resonant frequency, output power, and DRO.
Synthesis and Characterization of Perovskite Manganate Based on La0.7Ca0.3MnO3 with Ni and Ti doping as Microwave Absorber Material Saptari, Sitti Ahmiatri; Mar’ah, Mufidatul; Taryana, Yana; Sudrajat, Nanang
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.577-585

Abstract

Research has been carried out on the effect of Ni and Ti doping on the microwave absorption properties of the perovskite manganate material La0.7Ca0.3Mn1-xNix/2Tix/2O3 (LCMNTO) with variations x = 0; 0.03; 0.05; and 0.1, which were synthesized by the sol-gel method. The effect of Ni and Ti doping on the structure, grain size, magnetic properties, and microwave absorption properties were investigated in detail by various analytical methods. XRD (x-ray diffraction) characterization showed that the material La0.7Ca0.3Mn1-xNix/2Tix/2O3 has a single phase with an orthorhombic crystal system. The SEM (scanning electron microscope) results showed a tendency to decrease in grain size when the composition of Ni and Ti dopants began to increase. VSM (vibrating sample magnetometer) characterization shows that La0.7Ca0.3Mn1-xNix/2Tix/2O3 is a soft magnet with magnetic properties that decrease with increasing Ni and Ti dopant composition. The characterization of VNA (vector network analyzer) in the 8-12 GHz shows that the highest ability to absorb microwaves is 98% at 8.24 GHz, and there is an addition of absorption areas point and widening of the absorption bandwidth. Thus, the material La0.7Ca0.3Mn1-xNix/2Tix/2O3 has the potential to become a microwave absorber material.
A-Site Doped in Perovskite La(1-x)Bax/2Srx/2Mn0.4Ti0.6O3 (x = 0, 0.1, and 0.3) for Absorbing Microwave Material Saptari, Sitti Ahmiatri; Hapitanur, Dinda; Taryana, Yana; Sudrajat, Nanang; Rahman, Ikhwan Nur; Nanto, Dwi
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 13 No. 2 (2023)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v13n2.p106-118

Abstract

Microwave radiation can have harmful effects on our bodies. With increased exposure due to online activities, it is essential to use absorber materials like perovskite manganate to reduce radiation. In this study, perovskite manganate La(1-x)Bax/2Srx/2Mn0.4Ti0.6O3 (x = 0, 0.1, and 0.3) was synthesized using the sol-gel method. X-ray diffraction (XRD) analysis revealed that the two samples were multi-phased, LaMnO3 and La2Ti2O7, and were formed, exhibiting a rhombohedral crystal structure (R -3 c). Morphological characterization of the sample surface using a Scanning Electron Microscope (SEM) showed that as doping increases, the grain size decreases from 282.02 to 245.63 nm at x=0 and x=0.3, respectively. This result implies that doping leads to more uniform grain distribution and enhanced grain refinement. Characterization via Vibrating Sample Magnetometer (VSM) revealed that the maximum saturation value, 0.79 emu/g, was attained when x = 0. This sample exhibits soft magnetic properties, as evidenced by its coercivity (Hc) value of < 1kOe. Results from the Vector Network Analyzer (VNA) indicate that the absorption capacity of La(1-x)Bax/2Srx/2Mn0.4Ti0.6O3 increases, with a maximum reflection loss value of -25.5 dB with 1.5 mm thickness. Consequently, La(1-x)Bax/2Srx/2Mn0.4Ti0.6O3 demonstrates potential as a microwave absorber material.
THE EFFECT OF BAKELITE BINDERS ON MAGNETIC PROPERTIES AND HARDNESS VALUES OF MQP-TYPE BONDED NdFeB MAGNETS Aryani, Lia; Bhakti, Bintang Surya; Mubarok, Ahmad Riziq; Septiyani, Ardita; Mulyani, R. Henny; Sudrajat, Nanang; Dedi, Dedi
Metalurgi Vol 38, No 2 (2023): Metalurgi Vol. 38 No. 2 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2023.718

Abstract

Permanent magnets are important in modern society as components in various devices used by many industries and consumers, especially in generators and electric motors. Bonded magnet technology allows combining powdered magnetic materials with polymers as a binder to produce magnetic components that can be applied to certain applications, such as SynRM (synchronous reluctance) motors. Bonded magnets are easy to form without sacrificing their magnetic properties, which are too large, and also reduce costs, making them more effective and efficient. This paper reports the results of a study on the manufacture of bonded magnets NdFeB using bakelite binder on MQP-type NdFeB magnets with a bakelite variation of 0.5 - 2 wt.%. The characterization included testing magnetic properties with Permagraph, morphology with SEM (scanning electron microscope), and hardness values with micro Vickers hardness tester. The results of this study obtained remanence values in the range 5.53 - 6.44 kG and hardness values in the range 341.8 - 507.9 HV for NdFeB bonded magnets. According to SEM observations, the bakelite polymer matrix has successfully bound NdFeB grains, and no porosity is visible.
Co-Authors -, Dedi Akmalia, Anisa Dina Aryani, Lia Bhakti, Bintang Surya Dedi Dedi Dwi Nanto, Dwi Frida Ulfah Ermawati Hapitanur, Dinda Lestari, Emilia Dwi Mar’ah, Mufidatul Mubarok, Ahmad Riziq Mulyadi, Dadang Mulyani, R. Henny Novrita Idayanti Rahman, Ikhwan Nur Saptari, Sitti Ahmiatri Septiani, Ardita Septiyani, Ardita Sukoco, Bagus Edi Sulaiman, Yaya Taryana, Yana Tony Kristiantoro, Tony