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All Journal Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Sains Materi Indonesia The Journal of Pure and Applied Chemistry Research JFA (Jurnal Fisika dan Aplikasinya) Omega: Jurnal Fisika dan Pendidikan Fisika InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Science and Technology Indonesia Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Spektra: Jurnal Fisika dan Aplikasinya PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Saptari, Sitti Ahmiatri
Department Of Physics, Faculty Of Science And Technology UIN Syarif Hidayatullah Jakarta
Aerospace Engineering Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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Sintesis dan Analisis Struktur Material Aktif Katoda LiFe0,7Mn0,2Ni0,1PO4 Betty Haifa Sarwono; Sitti Ahmiatri Saptari; Bambang Prihandoko
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics | Vol.1
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v1i1.8998

Abstract

Abstrak. Sebuah sintesis material katoda LiFe0,7Mn0,2Ni0,1PO4 dengan metode solid-state telah selesai dilakukan. Bahan dasar yang digunakan adalah LiOH.H2O, α-Fe2O3, MnO2, Ni dan H3PO4. Bahan yang digunakan ada yang berasal dari bahan baku lokal yaitu α-Fe2O3 dan MnO2 dan sisanya menggunakan bahan import dari china. Pada penelitian ini digunakan variasi waktu sintering yaitu 4 jam, 6 jam,8 jam dan total 10 jam dengan temperatur 800oC. Karakterisasi dilakukan dengan menggunakan pengujian Difraktometer Sinar-X (XRD). Analisis data XRD dilakukan dengan menggunakan perangkat lunak PDXL Rigaku. Hasil analisis menunjukkan bahwa sintering pada temperatur 800oC selama total 10 jam menghasilkan fasa LiFe0,7Mn0,2Ni0,1PO4 yang satu fasa. Dan co-doping Mn dan Ni berhasil didoping pada LiFePO4. Abstract. Synthesis Cathode material, LiFe0,7Mn0,2Ni0,1PO4, has been synthesized by the solid-state method. Basic materials that used in this research are LiOH.H2O, α-Fe2O3, MnO2, Ni, and H3PO4. Several basic materials that used in this research obtained from the local raw material such as α-Fe2O3 and MnO2, and the remaining materials obtained by importing from China. Sintering time in this research are varied from 4 hours, 6 hours, 8 hours, and 10 hours, and all varied time are treated at 800°C. The characterization that used in this research is X-Ray Diffractometer (XRD). XRD data are analyzed using PDXL Rigaku software. The results of this research show that sintering at 800°C during total time 10 hours yields LiFe0,7Mn0,2Ni0,1PO4 in one phase. Co-doping Mn and Ni had been successfully doped in LiFePO4.
Sintesis dan Karakterisasi Barium Heksaferit dengan Variasi Pengurangan Massa Fe2O3 Ryan Rizaldy; Sitti Ahmiatri Saptari; Wisnu Ari Adi
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics | Vol.1
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v1i2.9504

Abstract

Barium Heksaferit berhasil disintesis dengan menggunakan metode solid state reaction, dalam upaya untuk menghasilkan fase yang tunggal, kami melakukan pengurangan massa dari Fe­2O3. Dimana kami mengurangi dengan komposisi tertentu, kami menggunakan faktor pengurangan x dengan variasi x = 1, 2, 3, dan 4. Hasil dari sintesis di karakterisasi menggunakan XRD untuk melihat fase-fase apa saja yang terbentuk. Hasil data XRD kami analisis menggunakan metode penghalusan Rietveld, dan mendapakan hasil dimana berkurangnya komposisi pengotor (dalam hal ini Fe2O3) pada hasil sintesis seiring dengan pengurangnya massa bahan baku Fe2O3
Library Visitor Noise Monitoring System Design With Warning Using LED and Telegram Nur Fitriani; Sitti Ahmiatri Saptari; Elvan Yuniarti
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.6, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v6iI.34280

Abstract

Abstract. The library supports education and is used as a place to learn and gain knowledge. To maximize its use, visitors need comfort by not making noise or upheaval that can disturb other visitors. According to the decision of the Ministry of Environment in 1996, the maximum standard for noise levels in libraries is 55 dB. This research was conducted to design a tool that can monitor the noise that occurs in the library by providing information on room conditions usingLED (Light Emitting Diode) lights, LCD (Liystal Displayquid Cr), and giving notifications to librarians in the form of messages on the Telegram application if the noise exceeds the limit. maximum. The tool is designed using ESP32 as a control, a GY-MAX4466 sensor to detect sound, and the output system uses red, yellow, and greenLED (Light Emitting Diode), LCD (Liquid Crystal Display) 16x2, and the Telegram application. The results of this study concluded that the noise monitoring system was running well, with a GY-MAX4466 sensor error rate of 0.4%, and the best R Square value was obtained at a distance of 1 meter from the sound source with an R Square value of 0,7202.
First-Principle Investigation of La0.7Ba0.3Mn(1-x)FexO3 Structural Properties Using CASTEP Sitti Ahmiatri Saptari; Sarah Aulia; Ryan Rizaldy; Anugrah Azhar
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 2 (2023): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i2.77031

Abstract

We conducted first-principles Density Functional Theory (DFT) calculations using the CASTEP software package to investigate the crystal structure and mechanical properties of Fe3+-doped La0.7Ba0.3MnO3 material at the Mn3+ site, with doping concentrations ranging up to 50%. Through geometry optimization, we simulated the X-ray diffraction (XRD) pattern. We observed that the doping of Fe did not result in a shift in the peak positions of the diffraction pattern. However, it led to an increase in intensity at the [012] peak and the splitting of peaks [104] and [110]. Regarding the mechanical properties, we examined the elastic constants and observed a reduction in the Bulk, Shear, and Young's modulus values. The Shear and Bulk modulus and Poisson's ratio indicated that La0.7Ba0.3Mn(1-x)FexO3 becomes less ductile with increased Fe3+ doping content. Furthermore, we performed calculations for the Debye temperature, which revealed a decrease in the thermal conductivity of the La0.7Ba0.3Mn(1-x)FexO3 material. 
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.
EXPERIMENTAL AND COMPUTATIONAL STUDY OF NITROGEN-DOPED TiO2 AS A PHOTOELECTRODE Saptari, Sitti Ahmiatri; Yuniarti, Elvan; Loua, Lamin Rene
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 2 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 2, August 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.082.03

Abstract

TiO2 has been widely used as a dye-sensitized solar cell (DSSC) photoelectrode, and attempts have been made to improve the performance of the photoelectrode by adding doping. This study aims to synthesize nitrogen (N) doped TiO2 as a photoelectrode. The research was carried out experimentally and computationally using X-Ray Diffraction (XRD) test equipment, Fourier Transform Infra-Red (FTIR), and quantum espresso software using the Density Functional Theory (DFT) method. XRD results showed that TiO2 has an anatase phase, and variations in the addition of nitrogen (doped N) of 10% w/w, 20% w/w, and 30% w/w did not produce a phase change. The FTIR results of N-doped TiO2 and TiO2 provide information on the functional groups of the samples. The wave number absorption area 1626 cm-1 indicates the presence of N-H bonds with a bending vibration mode. In addition, it can be seen that there is an N-H bond with a stretching vibration mode at wave number 3436 cm-1. Computational calculations searched the band gap energy of each variation of N doping, and each obtained was 3.2 eV; 2.54 eV; 2.35 eV; and 1.64 eV. The results of this study indicate that the N-doped TiO2 photoelectrode is expected to produce better DSSC efficiency because the addition of N-doped to TiO2 causes a decrease in the bandgap energy. The N doping effect causes a new energy level. The new energy level must be positioned close to the existing valence and conduction bands. As a result, the energy required for electrons to transition from the valence band to the conduction band is reduced, effectively reducing the energy gap between the two. This change in electronic structure facilitates more effortless movement of electrons, driving increased conductivity.
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.
Dye Sensitized Solar Cells with X% Cu-TiO2 Photoelectrode Sensitized from Syzygium malaccense Fajriah, Nurul; Yuniarti, Elvan; Saptari, Sitti Ahmiatri
Jurnal Fisika dan Aplikasinya Vol 20, No 1 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i1.16611

Abstract

Abstract: Dye Sensitized Solar Cell preparation with x% Cu-TiO2 photoelectrode sensitized from Jamaica guava leaf dye (Syzygium malaccense) has been successfully made. This DSSC composed of x% Cu- TiO2 Photoelectrode synthesized by the doctor blading method with variation concentration Cu dopant at 0%, 1%, and 5%. Sensitizer (dye) made with technique maceration; electrolyte solution used an iodine solution, counter electrode with a carbon layer made from a candle flame; all the components are then arranged like a sandwich. The layers were characterized by X-ray diffraction to determine the phase, structure, and crystal size. X-ray diffraction characterization was carried out on all x% Cu-TiO2 layers. X-ray diffraction results show that has identified TiO2 anatase phase compound with a tetragonal crystal structure and has an average crystal size obtained from calculations using the Williamson Hall method for 0%, 1%, and 5% Cu doping fractions respectively are 60.28 nm, 43.32 nm, and 53.32 nm. UV-Vis's spectrophotometric characterization was carried out to determine the optical properties of the dye, and the results showed that Jamaica guava leaf dye has light absorption at a wavelength between 400-700 nm with a band gap energy of 1.728 eV. Furthermore, the current-voltage (IV) characterization was carried out to determine the efficiency of the solar cell. Based on the research results, the addition of Cu dopants as Photoelectrode can increase the efficiency of DSSC at a certain concentration. The highest efficiency achieved is 0.0036 % at 1% Cu doping concentration.  
Synthesis and Characterization of Activated Carbon From Biomass Waste as A Microwave Absorber Material Nuras, Muhammad Ishaq; Saptari, Sitti Ahmiatri; Tjahjono, Arif; Priambodo, Danang Pamungkas; Haiqal, Amanda
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.7, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v7i1.41310

Abstract

Excessive use of electronic technology can result in harmful radiation and electromagnetic interference, which pose risks to human health. To address this issue, researchers developed a material designed to absorb electromagnetic waves. The study focused on synthesizing and characterizing activated carbon derived from biomass waste, including water hyacinth, melinjo seed shells, and chicken eggshells, with the goal of reducing electromagnetic wave interference. The research process involved several key steps: washing the biomass materials, followed by carbonization, activation using a 65% KOH solution, and subsequent characterization of the material. The tests revealed that the activated carbon possessed a porous structure, which is essential for its absorption capabilities. The surface areas measured were 4.378 m²/g for water hyacinth, 2.518 m²/g for melinjo seed shells, and 2.992 m²/g for chicken eggshells. These surface areas are indicative of the material's potential effectiveness. Additionally, the microwave absorption capacities of the activated carbon were recorded as -18.342 dB for water hyacinth, -13.326 dB for melinjo seed shells, and -12.484 dB for chicken eggshells. These findings suggest that the activated carbons are highly effective as microwave absorber materials, with an absorption efficiency ranging between 94% and 98%.Excessive use of electronic technology can result in harmful radiation and electromagnetic interference, which pose risks to human health. To address this issue, researchers developed a material designed to absorb electromagnetic waves. The study focused on synthesizing and characterizing activated carbon derived from biomass waste, including water hyacinth, melinjo seed shells, and chicken eggshells, with the goal of reducing electromagnetic wave interference. The research process involved several key steps: washing the biomass materials, followed by carbonization, activation using a 65% KOH solution, and subsequent characterization of the material. The tests revealed that the activated carbon possessed a porous structure, which is essential for its absorption capabilities. The surface areas measured were 4.378 m²/g for water hyacinth, 2.518 m²/g for melinjo seed shells, and 2.992 m²/g for chicken eggshells. These surface areas are indicative of the material's potential effectiveness. Additionally, the microwave absorption capacities of the activated carbon were recorded as -18.342 dB for water hyacinth, -13.326 dB for melinjo seed shells, and -12.484 dB for chicken eggshells. These findings suggest that the activated carbons are highly effective as microwave absorber materials, with an absorption efficiency ranging between 94% and 98%.
Microwave Absorption Potential of La0.7[X0.95Y0.05]0.3MnO3 with Dual-Doped Sites {XY = (Ca,Ba), (Ca,Sr), and (Sr,Ba)} Apriatin, Apriatin; Saptari, Sitti Ahmiatri; Tjahjono, Arif
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.7, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v7i2.47935

Abstract

The technology in the field of electronic devices is currently advancing in line with the increasing usage by humans. This continuous and growing usage also increases the amount of microwave radiation generated. This leads to wave interference that can disrupt the functionality of application devices. Absorbing materials are a type of material that functions as a microwave absorber. This study engineered lanthanum manganate material, specifically La0.7[X0.95 Y0.05]0.3MnO3 {XY = (Ca,Ba), (Ca,Sr), and (Sr,Ba)}, synthesized using the sol-gel method. The X-Ray Diffraction characterization results showed that each sample has a single-phase orthorhombic structure with a space group of Pbnm (62). The Scanning Electron Microscope–Energy Dispersive Spectroscopy characterization revealed particle morphology with varying particle size distributions on a micro-scale. Based on Vibrating Sample Magnetometer results, the samples La0.7[Ca0.95Ba0.05]0.3MnO3 and La0.7[Ca0.95Sr0.05]0.3MnO3 exhibit paramagnetic properties, while La0.7[Sr0.95Ba0.05]0.3MnO3 exhibits superparamagnetic properties. Through Vector Network Analyzer characterization, it was found that lanthanum manganate doped with Ca, Ba, and Sr demonstrated high electromagnetic wave absorption capabilities, achieving an absorption rate of 97%–98% at frequencies of 10–10.5 GHz. Thus, La0.7[X0.95 Y0.05]0.3MnO3 {XY = (Ca,Ba), (Ca,Sr), and (Sr,Ba)} is a potential candidate as a microwave-absorbing material.
Co-Authors Adhika Junara Karunianto Agung Imaduddin Ahmad Firdaus Ana Hasanah Anggita Prasanti Anugrah Azhar Apriatin, Apriatin Arif Tjahjono Arif Tjahjono Arif Tjahjono Azwar Manaf Bagus Septyanto Bambang Prihandoko Betty Haifa Sarwono Budhy Kurniawan Christin Rina Ratri Deni Shidqi Khaerudini Dewi Lestari Dian Nurdiana Dwi Nanto, Dwi Elvan Yuniarti Erfan Handoko Fajar Arif Kurniawan Fajriah, Nurul Fira Rizky Haiqal, Amanda Hanuarjie, Baskan Hapitanur, Dinda Hilwa Kamilah Juli Hartati Kumila, Biaunik Niski Kurniawan, Budhy Kurniawan, Budhy Laksanawati, Wahyu Dian Lediliocza Lediliocza Loua, Lamin Rene Mar’ah, Mufidatul Muhammad Fajri Maulana Muhammad Umar Faruqi Mujadid Al-Rabi Nada Hashida Lathifah Nadhia Fairuz Syafira Nanang Sudrajat, Nanang Nur Fitriani Nuras, Muhammad Ishaq Nurlaela, Ai Pratama, Elfriani Dita Priambodo, Danang Pamungkas qolby sabrina Rahman, Ikhwan Nur Riser Fahdiran Ryan Rizaldy Sarah Aulia Slamet Priyono Taryana, Yana Titik Lestariningsih Tjahjono, Arif Utami Widyaiswari Widyaiswari, Utami Wisnu Ari Adi Yuniarti, Elvan Yuniarti, Elvan