The partial pressures of Hg, Cd, and Te2 are obtained along the three‐phase curves for 10,20,normaland 58 normalMole Percent CdTe , normalHgTe‐normalCdTe solid solutions by measuring the optical absorbance of the coexisting vapor between 220 and 700 nm. The pressure ranges covered are 10−2–32 atm for Hg, 10−8–10−5atm for Cd, and 10−5–10−2 atm for Te2 , and Hg is always the predominant vapor species. The data allow the calculation of the chemical potentials of normalHgTe and normalCdTe and the Gibbs free enthalpy of formation for the solid solutions. In addition, the solidus temperatures are obtained directly from the optical absorbance measurements.

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Calibration experiments are reported that enable the partial pressures of Hg, Te2 , and Cd to be calculated from measurements of the optical absorbance between 220 and 700 nm of the vapor phase. In particular, the self‐broadening and Hg‐broadening coefficients of the 228.7 and 325.7 Cd lines are established. The pressure ranges are between 10−2 and 32 atm for Hg, 10−4 and 10−2 atm for Te2 , and 10−7 and 10−5 atm for Cd. These calibrations are used in a study of the normalHgTe‐normalCdTe solid solution containing 41.6 normalMole Percent CdTe to determine all three partial pressures along the three‐phase curve, the chemical potentials of normalHgTe and normalCdTe components, and the Gibbs free enthalpy of formation. Density and lattice parameter as a function of normalCdTe content are also reported.

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