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Chemical and physical insight on the local properties of the phosphides XSiP 2 (X=Be, Mg, Cd, Zn and Hg) under pressure: from first principles calculations

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  • Tarik Ouahrani

Abstract

Local properties of the XSiP 2 (X=Be, Mg, Cd, Zn and Hg) compounds are revisited through the partition of static thermodynamic properties under pressure. We pay attention to the metallization that occurs when the investigated compounds undergo a phase transition from chalcopyrite to the NaCl structure. Electron localization function analysis shows that the local valence basin attractors values decrease as a function of pressure. As the pressure increases, the tetragonal distortion (c/a) diminishes while the degree of ionicity enhances. In addition, by means of atom in molecule approach, atomic-like local compressibility and pressures are analyzed. We found that the basins volumes of the investigated compounds in the NaCl phase have lower compressibilities than those in the chalcopyrite phase. According to the predicted core-valence basins, the phosphorus cation is found to be the more affected by the hydrostatic pressure. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • Tarik Ouahrani, 2013. "Chemical and physical insight on the local properties of the phosphides XSiP 2 (X=Be, Mg, Cd, Zn and Hg) under pressure: from first principles calculations," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(9), pages 1-11, September.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:9:p:1-11:10.1140/epjb/e2013-40415-6
    DOI: 10.1140/epjb/e2013-40415-6
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    Solid State and Materials;

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