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Farzand Abdullatif
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Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika
Published by Universitas Jenderal Soedirman
ISSN : 26147580     EISSN : 26151219     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology
Jurnal Teras Fisika menyediakan sebuah forum penting yang mengungkap dan membahas kontribusi asli dalam bidang Fisika mulai dari Teori, Modeling sampai dengan aplikasinya yang meliputi: Fisika Partikel, Fisika material, Instrumentasi dan Pengukuran, Fisika Bumi dan Lingkungan, Biofisika dan Fisika Medis.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 82 Documents
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Electronic Properties of Fe3-xCoxO4 (x = 0.25 and 0.375) Synthesized from Natural Iron Sand: Evaluation of Band Gap and Urbach Tail Saputra, Kormil; Inayah, Rahmatun; Aminy, Ika Umratul Asni; Ardianto, Teguh; Kurniawidi, Dian W.
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 8 No 2 (2025): 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.2025.8.2.17580

Abstract

Fe3-xCoxO4 nanoparticles (x = 0.25 and 0.375) were successfully synthesized using natural iron sand as the base material through a coprecipitation method with the addition of CoCl2·6H2O as a cobalt source. Optical characterization was carried out using UV–Vis spectroscopy in the wavelength range of 200–800 nm to analyze the electronic properties of the material. The measurement results showed that increasing the cobalt fraction strengthened the absorption in the visible region and shifted the absorption onset to lower energies, indicating a narrowing of the band gap energy. Tauc analysis revealed that the direct gap energy decreased from 2.271 eV (x = 0.25) to 2.221 eV (x = 0.375), while the indirect gap energy decreased from 2.222 eV to 2.204 eV. Furthermore, the Urbach energy calculation shows an increase from 0.073 eV at x = 0.25 to 0.074 eV at x = 0.375, indicating an increase in local disorder that broadens the band tail. This finding is consistent with previous research reports on Co-doped magnetite and CoFe2O4, and confirms that cobalt doping is effective in enhancing the visible light absorption capacity. Thus, Fe3-xCoxO4 based on natural iron sand, especially at x = 0.375, has potential applications as an active material in visible light-based photocatalysis and solar energy optoelectronic devices.
Identifikasi Struktur Bawah Permukaan Daerah Potensi Panas Bumi Bajawa dan Sekitarnya Menggunakan Metode Gravitasi Novianti, Teti Amalia; Perdhana, Radhitya; Zulfian, Zulfian
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 8 No 2 (2025): 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.2025.8.2.17745

Abstract

This study aims to identify the subsurface structure of geothermal systems in the Bajawa area, East Nusa Tenggara, using gravity methods based on GGMplus 2013 satellite data. The analysis was conducted on complete Bouguer anomaly data that had been corrected and separated into regional and residual components using Butterworth filters. 3D modeling and 2D cross-section incisions were performed on regional anomalies, having density variations between 1.9 - 3.5 g/cm³, a range of regional anomaly values of 92-138 mGal and depths up to 4.43 km. Based on the results of the analysis of the distribution of rock density values, suspected rock formations as geothermal systems such as the presence of reservoirs from the Nangapanda formation (Np) with densities ranging from 1.9 - 2.66 g/cm³, host rocks from the Aimere Scoria formation (As), Andesite Sasa (Ss), Andesite Inie Lika (Ik), Andesite Mataloko (Mk), Andesite Bobo (Bb) and Andesite Siutoro (Si), Inerie Basalt (Ie), Wabela Basalt (Wa), Lahar Deposit (Lh) and Tuf Welas (Wt) with densities ranging from 2.49 - 2.8 g/cm³ and heat sources from Maumbawa Basalt (Mb) with densities ranging from 2.7 -3.5 g/cm³ and Andesite Wangka (Wn) with densities ranging from 1.9 -2.9 g/cm³. This finding strengthens the indication that the Bajawa area and its surroundings could be a potential prospect area for geothermal systems.

Page 9 of 9 | Total Record : 82

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