High-pressure phase diagram of ZnSexTe1–x alloys.

J. Pellicer-Porres (1) , D. Martínez-García (1) , Ch. Ferrer-Roca (1) , A. Segura (1) , V. Muñoz-Sanjosé (1) , J. P. Itié (2) , A. Polian (2) , P. Munsch (2)

1 ICMUV - Institut Universitari de Ciencia dels Materials
2 IMPMC - Institut de minéralogie et de physique des milieux condensés

We have performed high-pressure energy dispersive x-ray diffraction experiments in ZnSexTe1–x alloys (x = 0, 0.1, 0.2, 0.55, 0.81, 0.93, 0.99, and 1.0) in order to establish their pressure-composition phase diagram, and characterize the equation of state of all the involved phases. We conclude that the electronic energy-volume dependence is similar in all compounds. The differences observed in the stability range of the cinnabar and Cmcm phases should then be discussed in terms of other factors, as the presence of energy barriers (cinnabar) or dynamical instabilities (Cmcm). We also argue that the cinnabar phase found is similar for all compositions. Finally we discuss the different compressibility observed in the Cmcm and rocksalt phases.

Mots clés: phase diagrams; high-pressure solid-state phase transformations; II-VI semiconductors; X-ray chemical analysis; X-ray diffraction; equations of state; zinc compounds; selenium compounds; wide band gap semiconductors

J. Pellicer-Porres, D. Martínez-García, Ch. Ferrer-Roca, A. Segura, V. Muñoz-Sanjosé, et al.. High-pressure phase diagram of ZnSexTe1–x alloys.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 71, pp.035210 (1-7). ⟨10.1103/PhysRevB.71.035210⟩. ⟨hal-00021410⟩