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Ab-initio calculations of structural, phonon and thermal properties of \(\hbox {Al}_x \hbox {Ga}_{1-x} \hbox {As}\) alloy

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Abstract

Structural, phonon and thermal properties of \(\hbox {Al}_x \hbox {Ga}_{1-x} \hbox {As}\) alloy for different values of x (x \(=\) 0.0, 0.25, 0.5, 0.75 and 1.0) have been investigated by quasiharmonic Debye–Einstein model and Quantum Espresso package. The correction of Vegard’s law for lattice constant has been examined and has a good agreement with other experimental and theoretical works. TO–LO splitting at gamma point, which is related to breaking of cubic symmetry, has been calculated by optical phonon mode calculation. It is found that by increasing the amount of Al in \(\hbox {Al}_x \hbox {Ga}_{1-x} \hbox {As}\) alloy, specific heat at constant pressure and Debye temperature will be increased.

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Authors and Affiliations

  1. Departemant of Physics, Ardabil Branch, Islamic Azad University, Ardabil, Iran

    A Fazeli Kisomi

  2. Department of Physics, Rasht Branch, Islamic Azad University, Rasht, Iran

    S J Mousavi

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  1. A Fazeli Kisomi
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  2. S J Mousavi
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Correspondence to A Fazeli Kisomi.

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Kisomi, A.F., Mousavi, S.J. Ab-initio calculations of structural, phonon and thermal properties of \(\hbox {Al}_x \hbox {Ga}_{1-x} \hbox {As}\) alloy. Pramana - J Phys 91, 18 (2018). https://doi.org/10.1007/s12043-018-1589-y

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  • DOI: https://doi.org/10.1007/s12043-018-1589-y

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