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Study of structural and electronic properties of AgCl and AgBr binaries

  • TALEM naima
  • BOUMIA Lakhdar
  • MIHOUB Sofiane
  • University of Tissemsilt, Institute of Science and Technology, Tissemsilt, 38000, Algeria; Laboratoire d’Etude Physique des Matériaux ;
  • University of Tiaret, Institute of Science and Technology, Tiaret , Algeria;
  • Corresponding author *Emailnaima.taleml@cuniv-tissemsilt.dz

This modest work was devoted to studying the structural and electronic properties of the AgCl and AgBr binaries in the cubic NaCl phase. In this study, we used the FP-LAPW method based on functional density theory (DFT). For the treatment of exchange potential and correlation, we used the local density approximation (LDA). The objective of this work is to predict and compare the structural and electronic properties of our materials with other theoretical and experimental results. Most of the results obtained were approximate.

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Control of dual star induction generator based on multi-level inverter used in wind energy conversion system

  • Mohamed Haithem LAZREG
  • Hamza MESAI-AHMED
  • Abderrahim BENTAALLAH
  • Laboratoire d’Automatique de Tlemcen (LAT), Université de Tlemcen, Algérie
  • Laboratoire ICEPS, Université Djillali Liabès BP 98 Sidi Bel-Abbès, Algérie
  • CISE - Electromechatronic Systems Research Centre, University of Beira Interior, Covilhã, Portugal
  • Corresponding author *mohamedhaithem.lazreg@univ-tlemcen.dz

This paper presents vector control of dual star induction generator (DSIG) integrated into variable speed wind energy and supplied by three-level NPC converters. Now the DSIG is the most common among multiphase machines when used in high power generation systems, which is associated with two converters. Maximum power point tracking (MPPT) for extracting a maximum of power fluctuating wind speed is illustrated. In order to decrease the fluctuations that appear in the currents generated by DSIG to the electrical network, we propose the NPC structure three-level inverter. Simulation results of a 1.5 MW Wind turbine are presented to illustrate the validity of this application.

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Contribution to the study of the CoFeTi Asquaternary Heusler material's structural, electronic, and magnetic properties

  • Fatima SOFRANI
  • Keltouma BOUDIA
  • Friha KHELFAOUI
  • Département des Science de la Matière , Faculté des Sciences et de la Technologie, Universitaire El Wansharissi Tissemsilt
  • Laboratory of Physico-chemistry of Advanced Materials, University of Djillali Liabes, BP 89, Sidi-Bel-Abbes 22000, Algeria
  • Laboratoy of physico-chemical studies University of Saida Dr Moulay Tahar, Saida, Algeria
  • Corresponding author *fatima.sofrani@cuniv-tissemsilt.dz

By simulating the structural, electronic, and magnetic properties of the QuateryCoFeTiAs Heusler compound, we presented a theoretical investigation in this work The calculations were performed using the generalized gradient (GGA) approximation and the WIEN2k code's application of the augmented plane wave method (FP-LAPW)which is based on density functional formalism (DFT). The results are consistent with important theoretical calculations.Our results showed that this compound conforms with the (Slater-Pauling) Mtot = (ZT - 24) μB rule and is a half-metallic material.

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First Principles Study of Europium doped Gallium Nitride in Wurzite Structure

  • AMIRI Benameur
  • TOUHAMI Nour El-Imane
  • Department of Physics, Normal High Scool , 08.000, Bechar, Algeria
  • Corresponding author *nour.ninat1999@gmail.com

In the present work, we have successfully deposited Sb antimony doped tin dioxide (SnO2) thin films with Several advantages over well known LCD's including increased brightness and viewing angle. We are currently investigating Eu doped GaN as a potential red phosphor for TEFL display applications. Eu doped GaN films were grown by solid source molecular beam epitaxy on Si (111) substates. The material was optically characterized through temperature dependent emission spectroscopy using a HeCd laser at 325 nm for above band gap excitation. A strong red emission was obtained at 622 nm, which corresponds to an Eu3+ inner 4f-shell transition from the 5D 0 to 7F2 state. Therefore, the observed thermal quenching of red Eu emission is assigned to a strongly temperature dependent pumping process.

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Investigation of the structural, Electronic and magnetic properties of Mn2PdSn Heusler alloy under hydrostatic pressure

  • Soumia ZEFFANE
  • Fethallah DAHMANE
  • Mohamed MOKHTARI
  • Département de sciences de la matière, Université de Tissemsilt, 38000 , Algérie.1
  • Laboratoire d’Etudes Physique des Matériaux, Département de physique énergétique, Université des Science et de Technologie, USTO MB, BP 1505 El M’naour, Oran, Algérie 2;
  • Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Département de Technologie, Université de Mascara, 29000, Algérie 3;
  • Corresponding author *zeffanesoumia@yahoo.com

The pressure effect on the structural, electronic and magnetic properties of Mn2PdSn Heusler alloy was investigated by the first-principles full-potential linearized augmented plane wave (FP-LAPW) method based on density functional theory (DFT). The exchange and correlation function has been chosen using generalized gradient approximation (GGA) within the parameterization of Perdew-burke-ernzerhof. The lattice constant, electronic density of state (DOS), and magnetic properties such as total magnetic moment were obtained under pressure. It was determined that the calculated lattice parameters are in good agreement with the literature. The Mn2PdSn is stable in the Hg2CuTi-type structure. Furthermore, we expect an extraordinary occurrence of pressure-induced metallic ferrimagnetism to half-metallic ferromagnetism transition in the cubic phase of Mn2PdSn alloy at hydrostatic pressures of 10 GPa.

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