KHEDIDJA Berarma
خديجة برارمة
khadidja.berarma@univ-msila.dz
06 60731925
- Departement of Chemistry
- Faculty of Sciences
- Grade MCA
About Me
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 1968-12-27 00:00:00
-
KHEDIDJA Berarma birthday
- 2023-12-11
-
2023-12-11
Computational characterization of structural, optoelectronic and thermoelectric properties of some double half-Heusler alloys X2FeY′Sb2 (X: Hf, Zr ;Y′: Ni, Pd)
A full-potential linear augmented plane wave (FP-LAPW) has been used to study the structural, electronic, and optical properties of double half-Heusler alloys X2FeY′Sb2 with X≡Zr, Hf and Y′≡Pd, Ni. Electronic band structures and densities of states calculations of the four studied double half-Heusler alloys indicate that they are semiconductors with an indirect gap. The optical spectra of dielectric constants, refractive indices, reflectivity, and light absorption are also discussed. In the energy range of 8–14 eV, the calculated optical properties and mainly the absorption spectrum show very high UV absorption. Additionally, DFT calculations were combined with Boltzmann transport theory to estimate the thermoelectric properties, such as the thermal and electrical conductivity, Seebeck coefficient, and figure of merit (ZT), versus the change of temperature and chemical potential. These alloys possess a suitable band gap for diverse optoelectronic applications, encompassing photovoltaics, UV sensors, and solar cells.
Citation
Khedidja BERARMA , SABER SAAD ESSAOUD , Said Al Azar;,Anas Y. Al-Reyahi,Ahmad A. Mousa; Ahmad Mufleh, , (2023-12-11), Computational characterization of structural, optoelectronic and thermoelectric properties of some double half-Heusler alloys X2FeY′Sb2 (X: Hf, Zr ;Y′: Ni, Pd), Phase Transitions, Vol:96, Issue:11, pages:1-16, Taylor & Francis
- 2022-09-10
-
2022-09-10
Theoretical study of the electronic and optical properties of SrVO3 Perovskite
Our work aimed to investigate the structural, electrical, and optical characteristics of SrVO3 Perovskite material using first principles calculations based on Density Functional Theory. The band structure and DOS studies revealed that the SrVO3 Perovskite compound had metallic properties. According to the DOS diagrams, the valence band maximum (VBM) is made up of hybridization of the O-2p and Fe-d orbitals, whereas the conduction band minimum (CBM) is largely made up of the Op orbital. The estimated real and imaginary components of the complex dielectric function were used to determine frequency-dependent linear macroscopic optical coefficients such as absorption coefficient, refractive index, extinction coefficient, reflectivity, and optical conductivity. Keywords: DFT, Perovskite, spin, band structure, absorption coefficient
Citation
SABER SAAD ESSAOUD , Khedidja BERARMA , ,(2022-09-10), Theoretical study of the electronic and optical properties of SrVO3 Perovskite,1st International Conference on Innovative Academic Studies,Konya/Turkey
- 2022-07-20
-
2022-07-20
First-principles study of structural, electronic and optical properties of double half-Heusler alloy :Ta2FeNiSn2
/
Citation
SABER SAAD ESSAOUD , Khedidja BERARMA , ,(2022-07-20), First-principles study of structural, electronic and optical properties of double half-Heusler alloy :Ta2FeNiSn2,The third International Conference on Applied Engineering and Natural Sciences,Konya/Turkey
- 2021
-
2021
Corrosion study of Ni/Al2O3 composite coatings on copper support.
Corrosion is that the process during which a metal is destroyed by a chemical or electrochemical reactions with substances in its environment. Corrosion may be a dangerous and very costly problem , which can often cause impairment of the function of the metal, the environment, or the technical system of which these form a part. Recognizing the symptoms and mechanism of a corrosion problem is an important preliminary step on the road to finding a convenient solution. One of the most common techniques used to prevent the corrosion is applying a protective coating of another metal that is more difficult to oxidize. The present work was focused on electrodeposition and characterization composite deposits of Ni/Al2O3 on a copper substrate. These deposits are obtained from watts bath without additives. The oxide is used in electrochemical deposition of a substrate within sufficient properties. Ni and Ni– Al2O3 films were galvanostatically deposited on copper substrate from nickel sulfate bath. The composite coatings were characterized by using electrochemical methods such as open circuit potential (ocp) measurements, polarization curves and electrochemical impedance spectroscopy. The corrosion tests in an aggressive 3.5% NaCl solution indicate a reduced electrochemical activity and a high corrosion resistance in the case of composite deposits compared to the deposition of pure Ni, being confirmed the beneficial effect of the incorporation of Al2O3 into the Ni matrix. The best results are obtained for a concentration of 5 g / l of Al2O3. The results of the impedance are in agreement with the results of the currents of corrosion . Keys word : Corrosion, electrolytic codeposition, nickel composite
Citation
Khedidja BERARMA , ,(2021), Corrosion study of Ni/Al2O3 composite coatings on copper support.,2ème Séminaire international sur les sciences de la matière (physique et chimie) Le 17 - 18 Septembre 2021 (Webinaire Oran, 31000, Algeria,Oran
- 2021
-
2021
Effect of organic compounds on corrosion inhibition of copper in chloride media
Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, carbonate or sulfide. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion. The problem of corrosion has assumed considerable importance today, given the greater use of metals and alloys in modern life .Any improvement in protection against corrosion therefore has a significant economic advantage. The scientific approach developed in this work is geared towards understanding the phenomena associated with corrosion and the search for compounds that can slow it down or even inhibit it. In this context, the object of our work is to test the inhibitory efficacy of sodium benzoate and sodium acetate compounds against copper corrosion in sodium chloride (NaCl) medium with different concentrations and temperatures. We used stationary electrochemical techniques for the determination of electrochemical parameters. The effect of sodium acetate and sodium benzoate, on the corrosion of copper in 3.5% NaCl, was tested at different concentrations and temperatures. The results obtained clearly show that the copper electrode corrosion inhibition process is better in the case of the addition of sodium benzoate (10-2M ) at constant temperature (20 ° C). Unlike sodium benzoate, adding sodium acetate to NaCl solution (3.5%) has a negative effect and increases corrosion. The inhibition study reveals that sodium benzoate offers the best inhibitory efficacy in this medium at room temperature, whereas sodium acetate is effective at a temperature of 40 ° C. Key words: Corrosion, Inhibitors, Sodium benzoate, Sodium acetate, Copper, Temperature, Concentrations.
Citation
Khedidja BERARMA , ,(2021), Effect of organic compounds on corrosion inhibition of copper in chloride media,1st international Webinar on Biological and Chemical (10/11-November, 2021.) Blida,Blida, Algeria
- 2019
-
2019
Inhibition de la corrosion de l’alliage de l’aluminium 2017A par l’acétate de sodium
Le sujet de ce travail porte sur un processus physico-chimique fondamental : la corrosion des métaux. La corrosion des surfaces métalliques a un énorme impact économique et environnemental négatif avec un coût estimé, lié aux dommages de la corrosion dans le monde, d'environ 2 milliards d'euros par an. Toute amélioration de la protection contre la corrosion présente donc un avantage économique important. L'approche scientifique développée dans ce travail est orientée vers la compréhension des phénomènes liés à la corrosion et la recherche de composés permettant de la ralentir, voire de l’inhiber. Les propriétés physico-chimiques intéressantes et les éventuelles applications technologiques de l’aluminium et ses alliages [1,2] nous ont motivés pour contribuer à l’étude du comportement électrochimiques vis-à-vis de la corrosion dans un milieu corrosif NaCl (3.5%) en absence et en présence de l’acétate de sodium (CH3COONa). Le comportement à la corrosion aqueuse de ces alliages a été étudié dans une solution de NaCl (3.5%) M par le suivi de l’évolution du potentiel en circuit ouvert (OCP), le tracé des courbes de polarisation potentio-dynamique et la spectroscopie d’impédance électrochimique (SIE). L’influence des paramètres, tels que le pH de la solution et la durée d’immersion, sur le comportement à la corrosion de ces alliages a été analysée. Mots clés: Alliages d’aluminium, Corrosion, Polarisation potentio-dynamique, Spectroscopie d’impédance électrochimique
Citation
Khedidja BERARMA , ,(2019), Inhibition de la corrosion de l’alliage de l’aluminium 2017A par l’acétate de sodium,International conference on Mechanics and Materials (ICMM19) Setif, 11- 12 /11/ 2019,Ferhat Abbas, Setif 1 University. Institute of Optics and Precision Mechanics
- 2018
-
2018
Corrosion behavior of composite coatings obtained by electrolytic codeposition of nickel with TiO2 nanoparticles
Titanium dioxide is one of the most important oxides used in the engineering materials. The oxide is used in electrochemical deposition of a substrate within sufficient properties. The objective of this work is the characterization of the composite deposits nickel titanium dioxide on copper substrate. These deposits are obtained from watts bath without additives [1]. The composite coatings of nickel incorpating TiO2 nanoparticules were obtained and characterized by using electrochemical methodes such as open circuit potential (ocp) measurements, polarization curves and electrochemical impedances spectroscopy, the corrosion behavior of the nickel-TiO2 coating was examined. The corrosion parameters determined from the polarization curves recorded in 3.5% NaCl indicate that the corrosion process on nickel-TiO2 composite surface is slower than on pure nickel. The impedance spectra recorded at the ocp showed in all cases an increase of polarization resistance in time . [1] D. Peltcher, ‘Industrial Electrochemistry, Chapman & Hall, New York, (1984) , p. 184. Chap. Keys word : Corrosion, electrolytic codeposition, nickel composite coating, TiO2nanoparticles
Citation
Khedidja BERARMA , ,(2018), Corrosion behavior of composite coatings obtained by electrolytic codeposition of nickel with TiO2 nanoparticles,International Symposium on Materials Chemistry (Boumerdes 19, 20 , 21 Mars 2018),Université M’hamed Bougara Boumerdès
- 2018
-
2018
Galvanostatic electrodeposition thin film of nickel with TiO2 nanoparticles on copper substrate from nickel sulfate bath.
The aim of this work was to produce and to characterize composite deposits of nickel titanium dioxide on copper substrate. These deposits are obtained from watts bath without additives [1]. Titanium dioxide is one of the most important oxides used in the engineering materials. The oxide is used in electrochemical deposition of a substrate within sufficient properties. Ni and Ni–TiO2 films were galvanostatically deposited on copper substrate from nickel sulfate bath. The composite coatings of nickel incorpating TiO2 nanoparticules were characterized by using electrochemical methodes such as open circuit potential (ocp) measurements, polarization curves and electrochemical impedances spectroscopy, the corrosion behavior of the nickel-TiO2 coating was examined. The corrosion tests in an agressive 3.5% NaCl solution indicate a reduced electrochemical activity and a high corrosion resistance in the case of composite deposits compared to the deposition of pure Ni, being confirmed the beneficial effect of the incorporation of TiO2 into the Ni matrix. The best results are obtained for a concentration of 5 g / l of TiO2.The results of the impedances are in agreement with the results of the currents of corrosion and the resistance of polarization which indicate the best resistance to corrosion in the case of the deposition of Ni obtained from the bath in the presence of 5 g / l TiO2 Keys word : Corrosion, electrolytic codeposition, nickel composite coating,
Citation
Khedidja BERARMA , ,(2018), Galvanostatic electrodeposition thin film of nickel with TiO2 nanoparticles on copper substrate from nickel sulfate bath.,International Conference on Materials Science 2018 (ICMS2018 –Sétif 12-14 Septembre),Ferhat ABBAS SETIF1 University, ALGERIA
- 2016
-
2016
Theoretical investigation of structural, electronic and thermodynamic properties of CrO2compound.
The structural, electronic and thermodynamic properties of CrO2 compound have been performed by first-principles density functional [1] calculations using the full linearized augmented plane wave (FP-LAPW) [2] method as implemented in the WIEN2k code[3]. We employed the local density approximation (LDA) [4] and generalized gradient approximation (GGA) [5] for the exchange-correlation (XC) potential. Also, we have used the Engel-Vosko GGA formalism) [6], which optimizes the corresponding potential for band structure and density of states. Ground state properties such as the lattice parameters (a, b and c), bulk modulus B and its pressure derivative B`, have been directly calculated and compared to previous experimental and theoretical results when available. The energy gaps obtained using (EV-GGA) approximation are in reasonable agreement with experiment. Finally, by using a quasi-harmonic Debye model, thermodynamic properties is also calculated and analyzed. The effect of temperature and pressure on the bulk modulus, volume and heat capacities are discussed
Citation
Khedidja BERARMA , ,(2016), Theoretical investigation of structural, electronic and thermodynamic properties of CrO2compound.,2ème Journée Internationales de Physique de Constantine (Décembre 2016),UNIVERSITE des Frères MONTOURI CONSTANTINE 1