First-Principles Investigation of Electronic and Related Properties of Cubic Magnesium Silicide (Mg2Si)
| Autor: | Allé Dioum, Yacouba I. Diakité, Yuiry Malozovsky, Blaise Awola Ayirizia, Aboubaker Chedikh Beye, Diola Bagayoko |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Computation, Vol 11, Iss 2, p 40 (2023) |
| Druh dokumentu: | article |
| ISSN: | 11020040 2079-3197 |
| DOI: | 10.3390/computation11020040 |
| Popis: | We present results from ab initio, self-consistent calculations of electronic, transport, and bulk properties of cubic magnesium silicide (Mg2Si). We employed a local density approximation (LDA) potential to perform the computation, following the Bagayoko, Zhao, and Williams (BZW) method, as improved by Ekuma and Franklin (BZW-EF). The BZW-EF method guarantees the attainment of the ground state as well as the avoidance of over-complete basis sets. The ground state electronic energies, total and partial densities of states, effective masses, and the bulk modulus are investigated. As per the calculated band structures, cubic Mg2Si has an indirect band gap of 0.896 eV, from Γ to X, for the room temperature experimental lattice constant of 6.338 Å. This is in reasonable agreement with the experimental value of 0.8 eV, unlike previous ab initio DFT results of 0.5 eV or less. The predicted zero temperature band gap of 0.965 eV, from Γ to X, is obtained for the computationally determined equilibrium lattice constant of 6.218 Å. The calculated value of the bulk modulus of Mg2Si is 58.58 GPa, in excellent agreement with the experimental value of 57.03 ± 2 GPa. |
| Databáze: | Directory of Open Access Journals |
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