<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Structural, electronic and optical properties of MgxCd1−x
                        Se (0 ≤ x ≤ 1) are calculated for the first time using density functional theory. Our results show that these properties are strongly dependent on molar fraction of particular components — x. The bond between Cd and Se is partially covalent and the covalent nature of the bond decreases as the concentration of Mg increases from 0 % to 100 %. It is found that MgxCd1−x
                        Se has a direct band gap in the entire range of x and the band gap of the alloy increases from 0.43 to 2.46 eV with the increase in Mg concentration. Frequency dependent dielectric constants ɛ1(ω), ɛ2(ω) refractive index n(ω) are also calculated and discussed in detail. The peak value of refractive indices shifts to higher energy regions with the increase in Mg. The larger value of the extraordinary refractive index confirms that the material is a positive birefringence crystal. The present comprehensive theoretical study of the optoelectronic properties of the material predicts that it can be effectively used in optoelectronic applications in the wide range of spectra: IR, visible and UV. In addition, we have also predicted the heat capacities (CV), the entropy (S), the internal energy (U) and the Helmholtz free energy (F) of MgxCd1−x
                        Se ternary alloys.</p></abstract>

Structural, electronic and optical properties of MgxCd1−x
                        Se (0 ≤ x ≤ 1) are calculated for the first time using density functional theory. Our results show that these properties are strongly dependent on molar fraction of particular components — x. The bond between Cd and Se is partially covalent and the covalent nature of the bond decreases as the concentration of Mg increases from 0 % to 100 %. It is found that MgxCd1−x
                        Se has a direct band gap in the entire range of x and the band gap of the alloy increases from 0.43 to 2.46 eV with the increase in Mg concentration. Frequency dependent dielectric constants ɛ1(ω), ɛ2(ω) refractive index n(ω) are also calculated and discussed in detail. The peak value of refractive indices shifts to higher energy regions with the increase in Mg. The larger value of the extraordinary refractive index confirms that the material is a positive birefringence crystal. The present comprehensive theoretical study of the optoelectronic properties of the material predicts that it can be effectively used in optoelectronic applications in the wide range of spectra: IR, visible and UV. In addition, we have also predicted the heat capacities (CV), the entropy (S), the internal energy (U) and the Helmholtz free energy (F) of MgxCd1−x
                        Se ternary alloys.

FP-LMTO study of structural, electronic, thermodynamic and optical properties of MgxCd1−x
                     Se alloys

Laboratory of Physical Chemistry of Advanced Materials, University of Djillali Liabes, BP 89, Sidi-Bel-Abbes, 22000, Algeria

Physics Department, Faculty of Sciences, Dr. Moulay Tahar University of Saïda, 20000, Saïda, Algeria

Institute of Nano Electronic Engineering, University Malaysia Perlis, 01000, Kangar, Perlis, Malaysia

Faculty of Exact Sciences, Department of Physics, Djillali Liabes University, PO Box 089, Sidi Bel Abbes, 22000, Algeria

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Structural, electronic and optical properties of MgxCd1−x
                        Se (0 ≤ x ≤ 1) are calculated for the first time using density functional...

FP-LMTO study of structural, electronic, thermodynamic and optical properties of MgxCd1−x Se alloys

Publié en ligne: 19 déc. 2014

Pages: 719 - 728

DOI: https://doi.org/10.2478/s13536-014-0254-5

Mots clés
structural properties, electronic and optical properties, thermodynamic properties, FP-LMTO method, ternary alloy

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

FP-LMTO study of structural, electronic, thermodynamic and optical properties of MgxCd1−x Se alloys

Publié en ligne: 19 déc. 2014

Pages: 719 - 728

DOI: https://doi.org/10.2478/s13536-014-0254-5

Mots clésstructural properties, electronic and optical properties, thermodynamic properties, FP-LMTO method, ternary alloy

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
structural properties, electronic and optical properties, thermodynamic properties, FP-LMTO method, ternary alloy