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A phase diagram of the PbSb 2 Te 4 –InSb system, which is polythermal cross section of the three-component PbTe–Sb 2 Te 3 –InSb system, was built using DTA, XRD, microhardness and density measurements. The system contains the PbSb 2 Te 4 ·(2 ± δ )InSb compound of variable composition, incongruently melting at 530 ± 5 °C, and with asymmetric area of homogeneity shifted to the side rich in InSb (+ δ = 0–2). The PbSb 2 Te 4 ·2InSb compound crystallizes in orthorhombic symmetry with unit cell parameters: a = 7.7640 A; b = 6.4144 A; and c = 3.6010 A, α = β = γ = 90°. The system also contains PbSb 2 Te 4 and InSb based boundary solid solutions extended from 0 to 10 and from 95 to 100 mol% InSb, respectively, at room temperature. |
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