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Hybrid functional investigations of the crystal structure, band gap energy, and elastic coefficients of GaAs1-xBix solid solutions

H. W. Cao ; Z. Y. Yu ; P. F. Lu ; J. Chen ; Shumin Wang (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Computational materials science (0927-0256). Vol. 105 (2015), p. 6-10.
[Artikel, refereegranskad vetenskaplig]

First-principles hybrid functional calculations have been performed to study the crystal structure, band gap energy, and elastic coefficients of GaAs1-xBix solid solutions. Three different structures in prototype wurtzite and orthorhombic symmetries are considered. Compared to O-16 and O-32 supercells, GaAs1-xBix alloys in W-16 structure are more stable with the lower formation energy for a given Bi concentration. The lattice constants of GaAs1-xBix solid solutions follow the Vegard's Law regardless of the three different structures. Although the band gap decreases with the increase of Bi concentration, the trends of the band gap energy in the W-16, O-16 and O-32 structures are nearly identical. The calculated elastic coefficients and bulk modulus display a discernible downward bowing and there exists a direct correlation between the elastic stiffness coefficients and strains. These results give a good understanding of the properties of GaAs1-xBix solid solutions.

Nyckelord: GaAs1-xBix, Hybrid functional, Elastic coefficients, Bulk modulus, First-principles



Denna post skapades 2015-06-26.
CPL Pubid: 218971

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Fotonik

Ämnesområden

Materialteknik

Chalmers infrastruktur