The temperature-composition phase diagram and the miscibility gap of Hg1-xCdxTe solid solutions by dynamic mass-loss measurements

Mechanical and Thermal Properties

“…[142]. According to Schmit [151] and Gambino et al [152], and as shown in Figure 8.16b, the system presents a miscibility gap in the solid state with a critical point at x = 0.55 and a temperature of 172 • C. This has been confirmed by other studies [153][154][155]. The X-ray data of Wiedermeier and Chen [156] showed that the phase separation occurs primarily in a thin surface layer at 140 • C and is reversible after annealing at 530 the X-ray photoemission study of Sporken et al [157], and a high pressure of Hg above the synthesis temperatures of the Hg 1−x Cd x Te alloys was observed to cause the appearance of Te precipitates in the crystal [158,159].…”

“…This conclusion contradicts the thermodynamics that forbids the presence of a miscibility gap for an ideal solution. Observations of Krotov et al [169], and of Chen and Wiedemeier [153] based on mercury vapor tension measurements, and those of Shamsuddin and Nasar [170] and of Goncharuk and Sidorko [154] based on emf measurements, have shown that the solid solutions Hg 1−x Cd x Te present a positive departure toward ideality, which means repulsive interactions between Cd and Hg in the lattice. The differences between thermodynamic properties of Hg 1−x Cd x Te alloys and that of the other A 2 B 6 solid solutions are confirmed by Barlow [171] on the basis of the phase diagram calculation in the framework of a binary regular solutions model.…”

“…255-268. Copyright (2006) Springer Science + Business Media) 16 Quasibinary system HgTe-CdTe: (a) phase diagram as proposed by Yang et al[142] and (b) the miscibility gap of the solid solution as reported experimentally by Gambino et al[152] (open circles), the data from Yu et al[140] (shown as line 1), the corrected results from Chen and Wiedermeier[153] (2), and the bimodal (3) and spinodal(4)curves calculated recently by Voronin et al [155]. (Reprinted with permission from Ternary Alloy Systems -Phase Diagrams, Crystallographic and Thermodynamic Data, Subvolume C, Non-Ferrous Metal Systems, Part 1 Selected Semiconductor Systems, ed by G. Effenberg and S. Ilyenko, Berlin, pp.…”

Numerical simulation of clustering phenomena for point-defects in HgCdTe

“…(12) In addition to these equations, a considerable number of other interactions occur in HgCdTe materials. However, in this study, we did not consider these interactions, such as VH~ e-~ Teng + VT~ , or Te i ~-> Te~g + Hgi,…”

Conditions de stabilité thermodynamique de la solution solide du système CdTe-HgTe

“…Une bonne cohérence des résultats thermodynamiques est obtenue par la minimisation de la fonction : E Wi [ f_f (1) où Wi sont les poids des ensembles de données. Ils sont choisis égaux à 1 pour les 8 ensembles de [2,3] …”