Abstract
Experiments on the crystal growth of pseudobinary lead-tin selenide from the vapour were performed under near-equilibrium conditions for SnSe molar fractions of 0 ≤ x ≤ 0.4, where the rocksalt structure exists. Precise X-ray lattice parameter measurements were carried out on single crystals by means of the Soller-slit method. A difference of 0.01 in x between the crystal and the remainders of the source was found for average x = 0.35, but for x = 0.15 it was barely significant. The compositional uniformity allowed applying the single crystals for determination of a linear dependence of the lattice parameter on the SnSe molar fraction. The dependence is valid for Pb 1- x Sn x Se solid solutions displaying metal excess (n-type conductivity).
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