First-principles calculations of structural, electronic and thermal properties of Zn1−x MgxS ternary alloys

• Autorzy: Samia Lamraoui , Rachid Bensalem , Khadidja Hacini , Hocine Meradji , Sebti Ghemid , Fouad Hassan
• Języki publikacji: EN

Abstrakty

EN

Structural, electronic and thermal properties of Zn1−x MgxS ternary alloys are studied by using the full potential-linearized augmented plane wave method (FP-LAPW) within the density functional theory (DFT). The Wu-Cohen generalized gradient approximation (WC-GGA) is used in this approach for the exchangecorrelation potential. Moreover, the modified Becke-Johnson approximation (mBJ) is adopted for band structure calculations. The dependence of the lattice constant, bulk modulus and band gap on the composition x showed that the first exhibits a small deviation from the Vegard’s law, whereas, a marginal deviation of the second from linear concentration dependence (LCD). The bowing of the fundamental gap versus composition predicted by our calculations agrees well with the available theoretical data. The microscopic origins of the gap bowing are explained by using the approach of Zunger and co-workers. Thermal effects on some macroscopic properties of Zn1−x MgxS alloys are also investigated using the quasi-harmonic Debye model, in which the phononic effects are considered. As, this is the first quantitative theoretical prediction of the thermal properties of Zn1−x MgxS alloys, no other calculated results and furthermore no experimental studies are available for comparison.

Słowa kluczowe

EN

FP-LAPW; DFT; structural properties; gap bowing; Debye model

• Czasopismo: Open Physics
• Rocznik: 2014
• Tom: 12
• Numer: 1
• Strony: 70-79

Daty

wydano

2014-01-01

online

2014-02-02

Twórcy

autor

Samia Lamraoui

• Laboratoire de Magnétisme et Spectroscopie des Solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba, Algeria

autor

Rachid Bensalem

• Laboratoire de Magnétisme et Spectroscopie des Solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba, Algeria

autor

Khadidja Hacini

• Laboratoire de Physique des Rayonnements, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba, Algeria

autor

Hocine Meradji

• Laboratoire de Physique des Rayonnements, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba, Algeria,

autor

Sebti Ghemid

• Laboratoire de Physique des Rayonnements, Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba, Algeria

autor

Fouad Hassan

• Laboratoire de physique des matériaux, Faculté des Sciences, Université Libanaise, Elhadath, Beirut, Lebanon

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Identyfikatory

DOI

10.2478/s11534-013-0322-1