Article
Materials Science, Multidisciplinary
Ammar Benamrani, Salah Daoud, Manal M. Abdus Salam, Hamza Rekab-Djabri
Summary: In this study, ab-initio calculations were performed to investigate the equation of state parameters, elastic constants, and thermal properties of Yttrium-Rhodium (YRh) rare earth intermetallic compound. The results show good agreement with experimental data for lattice parameters and theoretical values for elastic constants. The compound is found to be mechanically stable and ductile in its B2 structure. Additionally, thermodynamic properties were studied and it was observed that various quantities exhibit different behaviors with increasing temperature.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Cihan Parlak
Summary: This study investigates the electronic and lattice properties of hexagonal SrGa2 binary system under external pressure using first-principles calculation methods. It examines fundamental quantities such as phonon dispersion curves, electronic band structures, Fermi surface topologies, and their relationship with the superconducting properties of SrGa2 material. Results show that information obtained directly from electronic band structures and Fermi surfaces is insufficient to explain the superconductivity phenomenon of these materials.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Silvia Leitner, Daniel Scheiber, Thomas Dengg, Juergen Spitaler, Thomas Antretter, Werner Ecker
Summary: We investigated the Mo2C precipitate and its interface with the Fe matrix using a combination of ab-initio density functional theory and finite element simulations. The elastic properties of Mo2C and Fe with temperature variations were determined, and different interfaces of the carbide with the matrix were characterized. By combining results from atomic to micro scale, we were able to explain the specific needle shape of these precipitates reported experimentally.
Article
Chemistry, Multidisciplinary
Christiane Stoll, Mihail Atanasov, Jascha Bandemehr, Frank Neese, Clemens Pietzonka, Florian Kraus, Antti J. Karttunen, Markus Seibald, Gunter Heymann, Hubert Huppertz
Summary: The synthesis of the compound K-3[MnF6] was reported using a high-temperature approach and crystallized by a high-pressure/high-temperature route. The compound contains two structural motifs of [MnF6]3- anions with significantly different nature.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Juan J. J. Aucar, Alejandro F. F. Maldonado, Juan I. I. Melo
Summary: In this work, relativistic corrections to the electric field gradient (EFG) are presented, including spin-dependent corrections for the first time. The results show that these new corrections significantly improve the performance of the existing method and are in close agreement with calculations at the four-component Dirac-Hartree-Fock (4c-DHF) level. The accuracy of the EFG values obtained with this new method allows for the analysis of the electronic origin of relativistic effects using well-known nonrelativistic operators.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
F. Djeghloul, Y. Medkour, M. Kharoubi, N. Bouarissa, A. Roumili
Summary: The electronic structure, optical and thermodynamic properties of M3GeMgN4 (M = Sr or Ba) nitrides were investigated using first-principles calculations. The results show good agreement with experimental data in terms of equilibrium lattice parameters and inter-atomic bond-lengths. The compounds were found to be mechanically stable and elastically soft, ductile and anisotropic. Both Sr3GeMgN4 and Ba3GeMgN4 exhibit semiconductor behavior with respective energy gaps of 1.476 eV and 1.194 eV. The chemical bonding in these semiconductors is primarily covalent, originating from hybridized states of Ge-N and Mg-N. The nitrides display moderate dielectric properties and high absorbance in the visible and UV range, making them suitable for optoelectronic applications. Phononic dispersion curves confirm the dynamical stability of the crystals.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Physics, Applied
Shukai Yao, Babak Anasori, Alejandro Strachan
Summary: 2D rare-earth metal carbides (MXenes) with novel electronic and magnetic properties and potential as scalable 2D magnets were investigated. The effect of the U parameter on the stability and magnetism of different termination sites was studied. It was found that Mo2NdC2O2 and Mo2NdC2(OH)(2) exhibited magnetic properties regardless of termination and Hubbard U value.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Vladimir A. Chernyshev, Calin N. Avram
Summary: In this paper, the structural properties of cubic impurity centers RE3+/RE2+ in fluorite crystals MeF2 were simulated using the ab initio route. The distortions of the crystal lattice near the impurity center were determined by doping with rare-earth ions, and the radial and angular displacements of anions were investigated. The study utilized the MO LCAO approach within the DFT method and compared the results with experimental data, showing satisfactory agreement.
Article
Biochemistry & Molecular Biology
Jitendra Kumar, Pradeep Tanwar, Uttam Paliwal, K. B. Joshi
Summary: The elastic, electronic, and vibrational properties of SnTe and PbTe were investigated and compared with experimental data. The inclusion of spin-orbit coupling resulted in bandgaps that were closer to experimental values. Additionally, the use of hybrid functionals provided higher bandgap values.
JOURNAL OF MOLECULAR MODELING
(2023)
Article
Engineering, Electrical & Electronic
A. Gherriche, A. Bouhemadou, Y. Al-Douri, S. Bin-Omran, R. Khenata, M. A. Hadi
Summary: The compound CsSrNb2O6F exhibits strong optical anisotropy, ductility, and strong elastic anisotropy characteristics.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Multidisciplinary Sciences
S. T. Ahams, A. Shaari, R. Ahmed, N. F. Abdul Pattah, M. C. Idris, B. U. Haq
Summary: MAX phase materials display characteristics of both metal and ceramic, with metallic properties and high density of states, suitable for applications such as thermal shock refractories and electrical contact coatings.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Sara Chaba Mouna, Missoum Radjai, Abdelmadjid Bouhemadou, Djamel Houatis, Djamel Allali, Saber Saad Essaoud, Saad Bin-Omran
Summary: In this study, we used the ab initio pseudopotential plane wave approach to investigate the properties of BaXCl3 (X = Li, Na) perovskites under hydrostatic pressures. The results showed that both BaLiCl3 and BaNaCl3 perovskites remained mechanically stable up to 18 GPa and several important parameters were calculated. These findings provide a more comprehensive understanding of the structural and thermodynamic properties of BaXCl3 (X = Li, Na) perovskites under pressure.
Article
Biochemistry & Molecular Biology
Yasemin O. Ciftci, Meryem Evecen, Irem O. Alp
Summary: Ab initio computations were used to study the structural, elastic, electronic, and vibrational characteristics of cubic antiperovskite compound PbNCa3 under pressure up to 50 GPa. The results indicated that the compound is stable up to 30 GPa, based on the computed elastic constant values and phonon dispersion relations.
JOURNAL OF MOLECULAR MODELING
(2021)
Article
Chemistry, Inorganic & Nuclear
Diana Benea, Viorel Pop
Summary: The intrinsic magnetic properties of (Fe1-xMx)(2)B alloys were calculated using the spin-polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR) band structure method. The transition metal elements M (M = Co, Ni, Mo, Ta, W and Re) can form stable M2B or FeMB alloys with a tetragonal Cu2Al structure type. The study aims to find a suitable dopant to switch the in-plane easy magnetization axis (EMD) to axial and enhance the magnetocrystalline anisotropy energy (MAE) without significant decrease of magnetization and Curie temperature.
Article
Chemistry, Physical
Alexander Bakulin, Sergey S. Kulkov, Svetlana E. Kulkova
Summary: In this study, analytic expressions for the temperature-dependent diffusion coefficient of oxygen in the alpha 2-Ti3Al alloy were obtained using Landman's method. The estimation of oxygen diffusion coefficient, pre-exponential factor, and activation energy was performed using migration barriers calculated by the first principle method within density functional theory. The validated method showed good agreement between the calculated diffusion coefficient of oxygen and available experimental data and theoretical results obtained within statistical approach.
Article
Materials Science, Multidisciplinary
Z. Zerrougui, M. A. Ghebouli, T. Chihi, Sameh Ahmed, L. Krache, B. Ghebouli, M. Reffas, M. Fatmi
Summary: The crystal structure and properties of the C14H12Br2S3 molecule were investigated, showing that the lattice parameters calculated using the LDA/CA-PZ method are in better agreement with experimental values. The band gap energy and Mulliken charges were also calculated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Physics, Multidisciplinary
K. Bouferrache, M. A. Ghebouli, B. Ghebouli, M. Fatmi, Sultan Alomairy, T. Chihi
Summary: Ab-initio simulations based on density functional theory were performed using the WIEN2k code with GGA, GGA+U, and mBJ approximations. FeMnCrSb was found to be the most stable structure with the lowest cohesive energy, and lattice constants of 5.95 angstrom and 6.2184 angstrom for GGA and GGA+U. The band structures of all studied quaternary Heusler alloys were metallic except for the spin up case using GGA+U and mBJ approaches, which exhibited semiconducting behavior. CoFeCrAl, CoFeMnSi, CoMnCrSi, and FeMnCrSb were identified as promising absorber materials for photovoltaic devices based on their absorption and band gap properties. Furthermore, these alloys showed high figure of merit (ZT) values of 0.8, 0.9, 0.95, and 1 at 300 K, indicating their potential for spintronic and thermoelectric applications. The resistivity of the alloys was found to have little dependence on temperature, while the electronic conductivity and power factor were proportional to temperature.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Crystallography
Fafa Chiker, Najet Baki, Yasser Abderrahim Khachai, Houari Khachai, Redouane Miloua, Rabah Khenata, Saad Bin-Omran, Abdelmadjid Bouhemadou, Mohammed Benali Kanoun, Souraya Goumri-Said
Summary: The present work is a theoretical study that investigates the structural and spin-polarized dependent optoelectronic thermoelectric properties of Gd(2)Be(2)GeO(7) compound. The results show that the compound is more stable in the ferromagnetic order and has a wide bandgap. Moreover, the frequency-dependent linear optical spectra and spin-polarized dependent transport properties are also studied.
Article
Physics, Condensed Matter
A. K. Kushwaha, A. Haddou, S. P. Mishra, Shivali Chauhan, R. Khenata, R. Ahmed, S. Bin Omran, A. Bouhemadou
Summary: In this research, the phonon modes related to the first Brillouin zone center of double perovskites Ba2MgWO6, Ba2ZnWO6, and Ba2CdWO6 are investigated using a theoretical model based on the six parameters bond-bending force constant. Debye temperature, elastic constants, and elastic properties are also evaluated. The results show that the first-neighbor interaction is stronger than the second and third neighbor's interatomic interactions, and the calculated results for frequencies of zone-center phonons and elastic constants agree well with the previously reported results.
COMPUTATIONAL CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
F. Zerarga, D. Allali, A. Bouhemadou, R. Khenata, B. Deghfel, S. Saad Essaoud, R. Ahmed, Y. Al-Douri, S. S. Safaai, S. Bin-Omran, S. H. Naqib
Summary: Ab initio full-potential calculations were used to study the mechanical and thermodynamic properties of the cubic spinels GeMg2O4, GeZn2O4, and GeCd2O4 under hydrostatic pressure. The results were consistent with existing theoretical and experimental data. The mechanical behavior and thermodynamic properties were assessed.
COMPUTATIONAL CONDENSED MATTER
(2022)
Article
Biochemistry & Molecular Biology
Maha Yousaf, Dua Fatima, Javaria Amin, Aqsa Noureen, Muhammad Qaiser Fatmi
Summary: KRAS is a crucial gene involved in pancreatic cancer, and the search for new therapeutic drugs has always been motivated by the need for prevention and treatment. G-quadruplexes, which play a role in gene expression and genome integrity, have emerged as potential drug targets. In this study, three compounds belonging to the tetra-substituted phenanthrolines class were found to effectively stabilize KRAS22RT G-quadruplex DNA and show low toxicity. Further experimental analysis is recommended to investigate their effectiveness and efficacy.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Crystallography
Missoum Radjai, Abdelmadjid Bouhemadou, Saad Bin-Omran
Summary: In this study, the pressure dependence of the structural, elastic and thermodynamic properties of ternary AlXY3 (X = B, C) compounds were investigated using the ab initio pseudopotential plane wave method. The results showed that the studied materials have stable mechanical properties with strong elastic anisotropy.
Article
Physics, Applied
F. Benlakhdar, M. A. Ghebouli, Z. Zerrougui, K. Bouferrache, Y. Slimani, B. Ghebouli, I. Bouchama, T. Chihi, M. Fatmi, Saif A. Mouhammad, Norah Algethami, Sultan Alomairy
Summary: In this study, the structural, elastic, mechanical, and electronic properties of pure and zinc-doped SrTiO3 were investigated using first-principles calculations. The synthesized compounds showed agreement with standard data, indicating the formation of stable compounds. A slight increase in lattice constant was observed in Zn-doped SrTiO3 due to the atomic radius difference between Zn and Ti. The elastic constants and mechanical parameters of SrTiO3 were found to be consistent with theoretical and experimental data. All investigated compounds exhibited brittle behavior, regardless of the Zn ratio. The band gap value decreased with increasing doping concentration, and the optimized band gap value for a 2% Zn concentration was close to the experimental value. The band gap of pure SrTiO3 was 1.827 eV, while the optimized values for Zn doping concentrations ranging from 1% to 10% were 1.970, 1.886, 1.802, 1.718, 1.635, 1.552, 1.470, 1.389, 1.310, 1.231, and 1.154 eV.
MODERN PHYSICS LETTERS B
(2023)
Article
Physics, Applied
A. Djemli, H. Belhouchet, A. Faci, M. A. Ghebouli, K. Bouferrache, Y. Slimani, T. Chihi, B. Ghebouli, M. Fatmi, Norah Algethami, Saif A. Mouhammad, Sultan Alomairy
Summary: The main objective of this research is to reduce waste and promote environmental sustainability by replacing imported feldspar limestone with recycled automotive glass. The study found that adding glass to the porcelain ceramics can lower the density and accelerate the sintering process, resulting in improved production efficiency.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Inorganic & Nuclear
Z. Zerrougui, K. Bouferrache, M. A. Ghebouli, Y. Slimani, T. Chihi, B. Ghebouli, M. Fatmi, F. Benlakhdar, Saif A. Mouhammad, Norah Algethami, Sultan Alomairy
Summary: All studied properties of FeX (X = Pt, Pd) in austenitic and martensitic phases were investigated using Local Spin Density Approximation. The equilibrium structural parameters for ferromagnetic tetragonal FePt and FePd were determined as a = 3.911 a, c = 3.842 a and a = 3.816 a, c = 3.736 a, and the lattice constant for ferromagnetic cubic FePt and FePd was found to be a = 4.9304 a and a = 4.905 a, which agreed well with existing theoretical and experimental data. The formation enthalpy of FePd and FePt in the martensitic phase was -12625.73 eV and -39414.97 eV, while in the austenitic phase it was -12625.33 eV and -39413.97 eV. The rock-salt FePd (tetragonal FePt) structure was found to be more stable than the tetragonal FePd (rock-salt FePt) structure. The anisotropy was more pronounced in the martensitic phase for both compounds.
SOLID STATE SCIENCES
(2023)
Article
Physics, Multidisciplinary
L. Krache, M. A. Ghebouli, B. Ghebouli, M. Fatmi, T. Chihi, S. I. Ahmed
Summary: We conducted a theoretical study on the hexahalometallate single crystals X2SnBr6 (X = Rb, Cs) using density functional theory and hybrid functional. The lattice constants of Cs2SnBr6 and Rb2SnBr6 matched the experimental data with uncertainties of 0.04% and 0.07% respectively. Cs2SnBr6's elastic moduli at equilibrium and under pressure were estimated for the first time. The interatomic distances in Cs2SnBr6 were larger than those in Rb2SnBr6, due to the larger radius of Cs. Cs2SnBr6 and Rb2SnBr6 exhibited semiconducting properties with direct band gaps of 1.272 eV and 1.1019 eV respectively. The conduction band minima were dominated by the Sn-s state, indicating an ionic connection between Sn and Br in both compounds.
ACTA PHYSICA POLONICA A
(2023)
Article
Multidisciplinary Sciences
A. Djemli, M. A. Ghebouli, K. Bouferrache, Y. Slimani, Mohamed A. Habila, M. Fatmi, T. Chihi, B. Ghebouli, Mika Sillanpa
Summary: This research examines the potential of using recovered automotive glass as a substitute for traditional feldspar in porcelain production. The results indicate that the inclusion of automotive glass accelerates the melting process and increases the vitreous phase of the porcelain. This study highlights the viability of using automotive glass as a sustainable and effective alternative to feldspar in porcelain production.
Article
Engineering, Multidisciplinary
Brahim Barka, Farid Rouabah, Magali Fois, Messaoud Fatmi
Summary: The hardness and erosion resistance of PMMA can be improved by annealing and quenching, with the most significant effect observed at a specific temperature and impact angle.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
M. Moutassem, T. Seddik, D. E. Si Mohammed, M. Batouche, H. Khachai, R. Khenata, R. Ahmed, V Srivastava, A. Bouhemadou, A. K. Kushwaha, S. Bin Omran
Summary: This study analyzes the effect of Na substitution on the electronic, structural, and thermoelectric properties of Li2CuAs. The calculations are carried out using the density functional theory and a full-potential linearized augmented plane wave plus local orbital method. The results show that Na substitution increases the bandgap of the material, which further increases with higher Na concentration. The study also analyzes the role of different electronic states on the bandgap structure and calculates the temperature effect on the thermoelectric properties.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Physics, Multidisciplinary
A. Faci, S. Benterki, M. Fatmi, Sameh Ahmed, B. Barka
Summary: This study investigates the effect of sand mass and grain size on the optical transmission and mechanical resistance of soda-lime glass subjected to sandblasting. The results show that increased sand mass and grain size lead to larger and more frequent defects on the glass surface, as well as increased roughness and damage.
PRAMANA-JOURNAL OF PHYSICS
(2022)