Abstract
Quaternary selenides Sn 2Pb 5Bi 4Se 13 and Sn 8.65Pb 0.35Bi 4Se 15 were synthesized from the elements in sealed silica tubes; their crystal structures were determined by single-crystal and powder X-ray diffraction. Both compounds crystallize in monoclinic space group C2/ m (No.12), with lattice parameters of Sn 2Pb 5Bi 4Se 13: a = 14.001(6) Å, b = 4.234(2) Å, c = 23.471(8) Å, V = 1376.2(1) Å 3, R 1/ wR 2 = 0.0584/0.1477, and GOF = 1.023; Sn 8.65Pb 0.35Bi 4Se 15: a = 13.872(3) Å, b = 4.2021(8) (4) Å, c = 26.855(5) Å, V = 1557.1(5) Å 3, R 1/ wR 2 = 0.0506/0.1227, and GOF = 1.425. These compounds exhibit tropochemical cell-twinning of NaCl-type structures with lillianite homologous series L(4, 5) and L(4, 7) for Sn 2Pb 5Bi 4Se 13 and Sn 8.65Pb 0.35Bi 4Se 15, respectively. Measurements of electrical conductivity indicate that these materials are semiconductors with narrow band gaps; Sn 2Pb 5Bi 4Se 13 is n-type, whereas Sn 8.65Pb 0.35Bi 4Se 15 is a p-type semiconductor with Seebeck coefficients −80(5) and 178(7) μV/K at 300 K, respectively.
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