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All Journal Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Sinergi Spektra: Jurnal Fisika dan Aplikasinya
Majidi, Muhammad Aziz
Departemen Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Indonesia, Jalan Margonda Raya, Pondok Cina, Beji, Kota Depok, Jawa Barat 16424, Indonesia
Aerospace Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Studi Teoritis Pembentukan Momen Magnetik pada Alloy half-Heusler Mn2Ge Anugrah Azhar; Muhammad Aziz Majidi
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics | Vol.2
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.913 KB) | DOI: 10.15408/fiziya.v2i1.11057

Abstract

Heusler alloy is a subclass material that consists of transition metal compounds with fascinating magnetic properties due to their magnetic moment value  that is still studied by many researchers due to their magnetic moment value that can be predicted using a simple calculation called Slater-Pauling rule (SP rule)s. According to the SP rule, when the total number of the valance electron gives a value of 18 (for half-Heusler alloy), the magnetic momen of this material is predicted by the value of 0 μB. By using this simple calculation, one can make material that have zero magnetic moment value. On the other hand, those this materials generally hasve halfhalf-metallic behavior in which the spin orientation only occurs on the one direction of either in the majority or minority spin channel. Starting from those issues, we propose a theoretical study to investigate the magnetic moment formation of halfhalf-Heusler alloyalloy Mn2Ge. Our results show that Mn2Ge have magnetic moment of 0.03 μB and show the halfhalf-metallic feature of Mn2Ge. 
Application of the detailed balance model to thermoradiative cells based on a p-type two-dimensional indium selenide semiconductor Muhammad Yusrul Hanna; Ahmad Ridwan Tresna Nugraha; Muhammad Aziz Majidi
SINERGI Vol 26, No 1 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.1.015

Abstract

Thermoradiative (TR) cells are energy conversion devices that convert low-temperature waste heat to electricity. TR cells work on the same principles as photovoltaics, but they produce a reverse bias voltage due to higher cell temperature than the environment temperature. Depending on the energy gap of the material, temperature difference would generate electrical energy by electron-hole pair recombination. In this work, we propose a two-dimensional (2D) InSe for applications in the TR cells. The electronic properties of 2D InSe are obtained by using first-principles calculations. Then, the calculated energy gap is used to estimate output power density and efficiency according to the Shockley-Queisser framework through a detailed balance model adapted with the TR cells. Using a heat source at  = 1000 K and the ambient temperature = 300 K, an ideal TR cell of 2D InSe at the maximum power point can achieve output power density and efficiency up to 0.061 W/m2 and 4.41%, respectively, with an energy gap of 1.43 eV. However, sub-bandgap and non-radiative losses will degenerate the cell's performance significantly.
THE DENSITY FUNCTIONAL THEORY STUDY OF Li-ION DIFFUSION IN Na-DOPED Li4Ti5O12 AS LITHIUM-ION BATTERY ANODE Achda Fitriah; Anugrah Azhar; Adam Badra Cahaya; Edi Suprayoga; Muhammad Aziz Majidi
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 3 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 3, December 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.073.04

Abstract

Spinel phase lithium titanate (Li4Ti5O12 or LTO) has been studied as an alternative anode material with a “zero-strain” characteristic structure to improve safety, cycling stability, and rate performance. LTO offers stable Li-ion diffusion at a higher charge-discharge rate without noticeable structural change. However, LTO exhibits low electronic conductivity and low Li-ion diffusion compared to graphite-based anode materials, limiting its rate capability. In this study, we investigate the impact of Na atom doping on the diffusion rate in the Li4Ti5O12 (LTO) spinel phase using the density functional theory (DFT). Based on the nudged elastic band (NEB) calculation, we obtain the energy barrier values and each diffusion pathway, with barrier energy varying about 0.3~0.4 eV and affecting the value of the diffusion constant obtained. The study reveals the role of Na atom doping in the lithium-ion diffusion in NaxLi4-xTi5O12 for battery anode material.
Co-Authors Achda Fitriah Ahmad Ridwan Tresna Nugraha Azhar, Anugrah Cahaya, Adam Badra Edi Suprayoga Muhammad Yusrul Hanna