Browsing by Author "Aouaroun, Tahar"

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    Behavior of phase transition of ZnO in nanoscale of time a molecular dynamics computation
    (IOP Publishing, 2021) Chergui, Yahia; Aouaroun, Tahar; Hadley, Mark J; Chemam, Rafik; Ouatizerga, A.
    The phase transition of Zinc Oxide Wurtzite structure is investigated at the nanoscale of time using Equilibrium time of total energy in isobaric and isothermal ensemble. The calculations ran on the RAVEN supercomputer of Cardiff University employing Molecular Dynamics simulation and DL_POL_4 software, the short and long-range interatomic interactions modeled by Bukingham-Coulomb potential. In this work we used low and high range of pressure and temperature of 0-30 GPa and 40-200 GPa, and 300-500 K and 1500-3000 K respectively. Although no data about confirming phase transition using equilibrium time of total energy as our knowledge, our results are in agreement with the classical method but are still a prediction which needs experimental confirmation. This work has great importance in nanotechnology and many industrial and academic sectors
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    Effect of Fe content on the structural and magnetic properties of ternary (Ni 60 Co 40 ) 100-x Fe x nanomaterials synthesized by hydrothermal route
    (World Scientific, 2024) Gaci, Yacine; Guittoum, Abderrahim; Hemmous, Messaoud; Martínez-Blanco, David; Gorria, Pedro; Blanco, Jesús A.; Aouaroun, Tahar
    The effect of iron content on the structure, morphology and magnetic properties of (Ni60Co40)100-xFex powders synthesized by hydrothermal method has been studied. Several samples have been elaborated for different Fe content (x = 0, 3, 5, 7, 10 and 13.5). The as- prepared samples have been characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometry (VSM). From XRD spectra and for all Fe content, we have shown the presence of both face centered cubic (FCC) and Hexagonal (HCP) nanosized phases. The lattice parameter increases with increasing Fe content and the grains size varies with Fe content to reach a minimum value of 32 nm for (Co40Ni60)90Fe10. From hysteresis curves, we have extracted the saturation magnetization, Ms, and the coercivity, Hc. We noticed that Ms increases and then decreases as a function of Fe content. The values of Hc vary from 156 Oe to 186 Oe depending on the particles shape.
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    Vortex plastic creep in a superconducting crystal of Tl-2223
    (Elsevier, 1998) Aouaroun, Tahar; Simon, Charles