Cu2O behavior under pressure An ab initio study - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2011

Cu2O behavior under pressure An ab initio study

Résumé

We have performed density-functional theory calculations for three crystallographic phases (cuprite, CdI2, and CdCl2) of the cuprous oxide by using both the local-density approximation (LDA) and the Perdew-Burke-Ernzerhof generalized-gradient approximation. The latter gives a very good description of the properties of the cuprite phase at room temperature. In particular, the bulk modulus and the elastic constants at zero pressure are in excellent agreement with experiment. At 10 GPa (7 in LDA calculations), the transition from the cuprite to the CdI2 phase occurs, and the latter remains the phase having the smallest Gibbs energy up to the maximum pressure we have considered (20 GPa). We have also determined the elastic constants of Cu2O in the cuprite phase for various applied pressures. The results indicate that this structure becomes unstable with respect to trigonal deformations before the transition to the CdI2 phase. On the other hand, no indication of instability with respect to tetragonal deformations has been found. This kind of instability would occur at pressures greater than the phase transition pressure. © 2011 IOP Publishing Ltd.
Fichier non déposé

Dates et versions

hal-02273312 , version 1 (28-08-2019)

Identifiants

Citer

P. Cortona, M. Mebarki. Cu2O behavior under pressure An ab initio study. Journal of Physics: Condensed Matter, 2011, 23 (4), pp.045502. ⟨10.1088/0953-8984/23/4/045502⟩. ⟨hal-02273312⟩
17 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More