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Single-crystal films of Pbi^Sn^Se alloys with rocksalt structure (0<#<0.33) have been deposited by evaporation on cleaved (100) faces of KC1 substrates. The energy gap E g at T=300, 195, and 77°K has been determined by measuring the optical transmission between 2 and 25 /xm. As x increases or T decreases, E g decreases for sufficiently low values of x, but increases for #>0.2 and r=77°K. The sign reversal in the composition and temperature dependence of E g shows that the Pbi-xSn^Se alloys exhibit the inversion in band structure recently proposed for the Pbi-xSn^Te alloys. If E g is assigned negative values for samples in which the conduction and valence bands are inverted from those in PbSe, the data are well represented by the equation E Q = 0.13+ (4.5X10~4 deg"" 1 ) T~0.S9x eV.

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2014 Cet article passe en revue les propriétés structurales, thermiques, mécaniques, optiques et électriques du tellurure de cadmium. Celles-ci sont par ailleurs comparées aux propriétés physiques des autres composés IIB-VIA.

The ternary Zn‐Cd‐Te liquidus surface and the pseudobinary CdTe‐ZnTe solidus curve have been determined by thermal analysis of cooling and heating curves, respectively, of homogenized liquid and solid alloy samples. The binary Cd‐Te and Zn‐Te liquidus arrest temperatures are in good agreement with most of the previously published data and confirm the presence of well‐ defined inflections on the metal‐rich and Te‐rich sides of both liquidus curves. The binary interchange energy parameters calculated along each liquidus curve for the regular and quasi‐chemical approximation solution models give essentially similar values for dilute solutions. Near equiatomic composition however, they show values respectively in excess of 200 kcal/mole and less than 40 kcal/mole. The pseudobinary CdTe‐ZnTe liquidus and solidus curves exhibit monotonic and sublinear increases in temperature with increasing ZnTe content. The gap between the two curves remains less than 0.16 mole fraction and shows excellent agreement with the values calculated from the ideal liquidus‐solidus thermodynamic relationship. The ternary liquidus temperatures form a smooth surface with a narrow ridge near the pseudobinary CdTe‐ZnTe composition line and practically degenerate ternary eutectic and boundary lines.