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Investigation of Thermal Properties of Half-Heusler Alloy FeVZ (Z= As, P, Sb) within Density Functional Theory Anugrah Azhar
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics | Vol.4
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.v4i1.19615

The figure of merit (ZT) holds an important role in thermoelectric material that indicates the efficiency of thermoelectric (TE) devices. The higher ZT value, the higher efficiency would be obtained of TE devices. One of the sub-class materials that has high potential application for thermoelectric material is half-Heusler (HH) alloy. In order to investigate the ZT value of HH conduct simulation using to investigate the ZT value of HH alloy FeVZ (Z= As, P, Sb) by using density-functional theory (DFT). Our research results show that FeVAs has higher ZT values than FeVP and FeVSb in the range temperature of 150-900 K. All of those compounds still have good ZT value around ~0.7 even in the temperature regime of 900 K, and shows a good trend for p-type thermoelectric materials.

Perancangan Sistem Kontrol Otomatis Berbasis Web Menggunakan Raspberry Pi 3 pada Smarthome Wais Al Qorni; Anugrah Azhar; 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.1
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Biasanya manusia mengontrol perangkat elektronik rumah dengan cara manual tetapi dengan penerapan rumah cerdas maka perangkat elektronik dapat dikontrol dengan menggunakan satu pengontrol pusat saja. Berdasarkan hal tersebut maka diperlukan sebuah mini pc yaitu sebuah perangkat komputer kecil atau mini. Mini pc yang digunakan adalah Raspberry pi, dengan Raspberry Pi yang menerapkan teknologi jaringan wireless dan wire yang dihubungkan dengan teknologi smartphone yang saat ini menjadi reward dalam perkembangan dunia teknologi. Tujuan penelitian ini adalah mendapatkan kemudahan dalam mengontrol perangkat elektronik yang ada didalam rumah dengan cara pengontrolan terpusat pada sebuah smartphone android. Sistem yang dirancang untuk mengontrol aktif dan non-aktif. perangkat seperti lampu, kipas angin, dan televisi ini dirancang dengan menggunakan LXTerminal pada raspbian, bahasa Python dan Android Studio sebagai sarana untuk membuat perangkat lunaknya. Pengujian dilakukan dengan menampilkan beberapa menu pada display aplikasi disertai dengan meletakkan seluruh perangkat keras yang sudah disusun dengan baik. Hasil pengujian menunjukkan bahwa perangkat elektronik seperti lampu, kipas angin, dan televisi berhasil dilakukan pengontrolannya (aktif dan non-aktif).,

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

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.

Spin-Orbit Effect on Thermal Properties of Half-Heusler Alloy FeVSb Anugrah Azhar
Jurnal Fisika dan Aplikasinya Vol 17, No 2 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i2.8973

FeVSb, a family of Half-Heusler alloy, is categorized as an n-type semiconductor which has a high figure of merit that makes this material to be one of the promising candidates for a thermoelectric device. In FeVSb, Fe and V atoms which have d-orbitals can be considered to have spin-orbit interaction that can affect the electronic structure and thermal properties of this material. In order to investigate how strong the spin-orbit interaction affect this material, we do the first-principles study by implementing the spin-orbit interaction to investigate the change of the band structure and thermal properties of FeVSb. Our results show that the spin-orbit interaction affects the band structure of the material indicated by the energy splitting in the electronic structure which increase the Seebeck coefficient, electrical conductivity, and thermal conductivity but slightly reduce the figure of merit values of FeVSb.

EFEKTIFITAS SOCIAL LEARNING NETWORK BERBASIS EDMODO TERHADAP HASIL BELAJAR SISWA SMA PADA MATERI ALAT OPTIK Setyo Warjanto; Nurhayati Nurhayati; Anugrah Azhar
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 3 (2014): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2014
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (240.182 KB)

Seiring dengan perkembangan internet yang semakin pesat, dunia pendidikan harus pula beradaptasi dengan perkembangan tersebut. Edmodo merupakan bukti pesatnya perkembangan teknologi internet yang ada. Penelitian bertujuan untuk meningkatkan efektifitas media social learning network berbasis Edmodo terhadap hasil belajar siswa Sekolah Menengah Atas pada mata pelajaran Fisika khususnya materi Alat Optik. Jenis penelitian ini merupakan penelitian eksperimen dengan desain two group pretes posttest design. Dalam penelitian ini juga menggunakan metode deskriptif. Instrumen yang digunakan adalah hasil belajar siswa dan hasil polling siswa. Data hasil belajar menunjukkan penggunaan social learning network berbasis Edmodo meningkat yaitu rata-rata pos tes 86.86 dengan n-gain 4.493 pada kelas eksperimen dan hasil belajar pada kelas kontrol tanpa penggunaan social learning network berbasis Edmodo meningkat yaitu rata-rata pos tes 76.78 dengan n-gain 2.273 . Dalam penelitian ini juga dikaji hasil polling siswa yang menunjukkan 75% setuju bahwa pembelajaran dengan menggunakan social learning network berbasis Edmodo dilanjutkan, dan selebihnya 25% menyatakan tidak setuju dilanjutkan Kata kunci : efektifitas, e-learning, edmodo, hasil belajar.

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

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.

Perancangan Sistem Kontrol Otomatis Berbasis Web Menggunakan Raspberry Pi 3 pada Smarthome Wais Al Qorni; Anugrah Azhar; 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.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.v1i2.9501

Biasanya manusia mengontrol perangkat elektronik rumah dengan cara manual tetapi dengan penerapan rumah cerdas maka perangkat elektronik dapat dikontrol dengan menggunakan satu pengontrol pusat saja. Berdasarkan hal tersebut maka diperlukan sebuah mini pc yaitu sebuah perangkat komputer kecil atau mini. Mini pc yang digunakan adalah Raspberry pi, dengan Raspberry Pi yang menerapkan teknologi jaringan wireless dan wire yang dihubungkan dengan teknologi smartphone yang saat ini menjadi reward dalam perkembangan dunia teknologi. Tujuan penelitian ini adalah mendapatkan kemudahan dalam mengontrol perangkat elektronik yang ada didalam rumah dengan cara pengontrolan terpusat pada sebuah smartphone android. Sistem yang dirancang untuk mengontrol aktif dan non-aktif. perangkat seperti lampu, kipas angin, dan televisi ini dirancang dengan menggunakan LXTerminal pada raspbian, bahasa Python dan Android Studio sebagai sarana untuk membuat perangkat lunaknya. Pengujian dilakukan dengan menampilkan beberapa menu pada display aplikasi disertai dengan meletakkan seluruh perangkat keras yang sudah disusun dengan baik. Hasil pengujian menunjukkan bahwa perangkat elektronik seperti lampu, kipas angin, dan televisi berhasil dilakukan pengontrolannya (aktif dan non-aktif).,

Investigation of Thermal Properties of Half-Heusler Alloy FeVZ (Z= As, P, Sb) within Density Functional Theory Anugrah Azhar
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics | Vol.4
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.v4i1.19615

The figure of merit (ZT) holds an important role in thermoelectric material that indicates the efficiency of thermoelectric (TE) devices. The higher ZT value, the higher efficiency would be obtained of TE devices. One of the sub-class materials that has high potential application for thermoelectric material is half-Heusler (HH) alloy. In order to investigate the ZT value of HH conduct simulation using to investigate the ZT value of HH alloy FeVZ (Z= As, P, Sb) by using density-functional theory (DFT). Our research results show that FeVAs has higher ZT values than FeVP and FeVSb in the range temperature of 150-900 K. All of those compounds still have good ZT value around ~0.7 even in the temperature regime of 900 K, and shows a good trend for p-type thermoelectric materials.

First-Principles Calculations of Thermoelectric Properties of Fe-Based Full- Heusler Fe2CuSi Nurlaela, Ai; Nanto, Dwi; Azhar, Anugrah; Yuniarti, Elvan; Kristiantoro, Tony; Dedi, Dedi
Makara Journal of Science Vol. 28, No. 3
Publisher : UI Scholars Hub

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

A first-principle study using density functional theory (DFT) and Boltzmann transport was conducted to evaluate the thermoelectric (TE) properties of an Fe-based full-Heusler alloy. The compound studied is Fe2CuSi with a Cu2MnAl-type structure. The electronic properties of Fe2CuSi were obtained using DFT calculations by running the Quantum ESPRESSO (QE) package. By contrast, TE properties, including electron thermal conductivity, electric conductivity, and Seebeck coefficient, were computed using a semi-empirical Boltzmann transport model solved through the BoltzTraP software at 50–1,500 K temperature range. The spin-orbit coupling effect on these properties was also evaluated, demonstrating notable effects on the results. Multiple electronic bands crossing the Fermi level for both spin directions were confirmed by the density of state curve, indicating the metallic behavior of Fe2CuSi. The magnitude of the figure of merit was determined by the Seebeck coefficient, electric conductivity, and electron thermal conductivity. In this study, the maximum dimensionless figure of merit was 0.027, reached at 1,000 K for the spin-down channel.

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