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A number of tetradymite-like layered compounds in the PbTe-Bi 2 Te 3 and PbTe-Sb 2 Te 3 systems were prepared by a vertical Bridgman process, and their crystal structures were investigated by x-ray diffraction using single-crystal cleaved specimens. The atomic positional parameters and bond distances in PbBi 4 Te 7 were determined. In the pseudobinary system PbTe-Sb 2 Te 3 , two new compounds were identified, PbSb 2 Te 4 and PbSb 4 Te 7 , isostructural with PbBi 2 Te 4 and PbBi 4 Te 7 , respectively. The positional parameters, site occupancies, and bond distances in the structure of PbSb 2 Te 4 were determined. The room-temperature thermoelectric power of the grown ingots was measured along their length. All of the Sb compounds studied were found to be p-type, in contrast to the compounds of the PbTe-Bi 2 Te 3 system.

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