Bilel Bellakhdhar
Bilel Bellakhdhar
*This is an algorithmically generated author record based on publicly available information.
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Bilel Bellakhdhar has a total of 3 co-authors. Here are the top co-authors by number of shared publications:
- Abdulrahman Mallah
Department of Chemistry, College of Science, Qassim University, Buraydah 51452, Saudi Arabia
2 shared publications - Mohamed Houcine Dhaou
Department of Physics, College of Science, Qassim University, Buraydah 51452, Saudi Arabia
2 shared publications - Mourad Debbichi
Université de Monastir, Faculté des Sciences de Monastir, Laboratoire de La Matière Condensée et Nanosciences LR11ES40, 5019 Monastir, Tunisia
2 shared publications
Latest Publications
- Open Access
Structural, Mechanical, and Piezoelectric Properties of Janus Bidimensional Monolayers
In the present work, the noncentrosymmetric 2D ternary Janus monolayers AlXX’(X/X’ = S, Se, Te and O), SiXX’(X/X’ = P, As, Sb and Bi), and APAs(A = Ge, Sn and Pb) have been studied based on first-principles calculations. We find that all the monolayers exhibit in-plane d, and out-of-plane d piezoelectric coefficients due to the lack of reflection symmetry with respect to the central A atoms. Moreover, our calculations show that AlOX(T = S, Se, Te) chalcogenide monolayers have higher absolute in-plane piezoelectric coefficients. However, the highest out-of-plane values are achieved in the SiPBi monolayer, larger than those of some advanced piezoelectric materials, making them very promising transducer materials for lightweight and high-performance piezoelectric nanodevices.Open AccessStructural, Mechanical, and Piezoelectric Properties of Janus Bidimensional Monolayers
In the present work, the noncentrosymmetric 2D ternary Janus monolayers AlXX’(X/X’ = S, Se, Te and O), SiXX’(X/X’ = P, As, Sb and Bi), and APAs(A = Ge, Sn and Pb) have been studied based on first-principles calculations. We find that all the monolayers exhibit in-plane d, and out-of-plane d piezoelectric coefficients due to the lack of reflection symmetry with respect to the central A atoms. Moreover, our calculations show that AlOX(T = S, Se, Te) chalcogenide monolayers have higher absolute in-plane piezoelectric coefficients. However, the highest out-of-plane values are achieved in the SiPBi monolayer, larger than those of some advanced piezoelectric materials, making them very promising transducer materials for lightweight and high-performance piezoelectric nanodevices. - Open Access
Structural, Mechanical, Electronic, Optical, and Thermodynamic Properties of New Oxychalcogenide A2O2B2Se3 (A = Sr, Ba; B = Bi, Sb) Compounds: A First-Principles Study
The structural, mechanical, electronic, and optical characteristics of Alkali chalcogenide and oxychalcogenides, i.e., AOBSe (A = Sr, Ba; B = Bi, Sb), were investigated using density functional theory (DFT). After full relaxation, the obtained structural parameters are in good agreement with the experimental parameters. Furthermore, the calculated elastic stiffness shows that all of the studied compounds followed the mechanical stability criteria. Ductility for these compounds was analyzed by calculating Pugh’s ratio; we classified the SrOBiSe, SrOSbSe, and BaOBiSe as ductile, and the BaOSbSe as brittle. The Debye temperature and acoustic velocity were estimated. In addition, electronic and chemical bonding properties were studied from the analysis of the band structure and density of state. The main features of the valence and conduction bands were analyzed from the partial density of states. Electronic band structures are mainly contributed to by Se- and Bi-/Sb- states. Direct band gaps are 0.90, 0.47, and 0.73 eV for SrOBiSe, SrOSbSe, and BaOSbSe, respectively. The BaOBiSe compound has an indirect band gap of 1.12 eV. Furthermore, we interpreted and quantified the optical properties, including the dielectric function, absorption coefficient, optical reflectivity, and refractive index. From the reflectivity spectra, we can state that these compounds will be useful for optical applications.Open AccessStructural, Mechanical, Electronic, Optical, and Thermodynamic Properties of New Oxychalcogenide A2O2B2Se3 (A = Sr, Ba; B = Bi, Sb) Compounds: A First-Principles Study
The structural, mechanical, electronic, and optical characteristics of Alkali chalcogenide and oxychalcogenides, i.e., AOBSe (A = Sr, Ba; B = Bi, Sb), were investigated using density functional theory (DFT). After full relaxation, the obtained structural parameters are in good agreement with the experimental parameters. Furthermore, the calculated elastic stiffness shows that all of the studied compounds followed the mechanical stability criteria. Ductility for these compounds was analyzed by calculating Pugh’s ratio; we classified the SrOBiSe, SrOSbSe, and BaOBiSe as ductile, and the BaOSbSe as brittle. The Debye temperature and acoustic velocity were estimated. In addition, electronic and chemical bonding properties were studied from the analysis of the band structure and density of state. The main features of the valence and conduction bands were analyzed from the partial density of states. Electronic band structures are mainly contributed to by Se- and Bi-/Sb- states. Direct band gaps are 0.90, 0.47, and 0.73 eV for SrOBiSe, SrOSbSe, and BaOSbSe, respectively. The BaOBiSe compound has an indirect band gap of 1.12 eV. Furthermore, we interpreted and quantified the optical properties, including the dielectric function, absorption coefficient, optical reflectivity, and refractive index. From the reflectivity spectra, we can state that these compounds will be useful for optical applications.