Abstract
Results of a study of the pseudobinary system PbTe-GeTe are reported and discussed. A new phase diagram, the dependence of the lattice constants on alloy composition, and measurements of a phase transformation in Pb 1− x Ge x Te are presented. Complete solid solubility is found above 570°C. An exsolution dome extends from a maximum at 570°C (near 60 mole % GeTe) to about 5 and 96 mole % GeTe at 300°C. For alloys with compositions near GeTe the unit cell parameters depend markedly on the concentration of cation vacancies. The temperature for the cubic to trigonal phase transformation depends on alloy composition, decreasing from about 670°K for x = 1 to 0°K for x ≈ 0·01. The variation of lattice parameters at the transition temperature is continuous within experimental precision.
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