Synthesis and phase width of new quaternary selenides PbxSn6−xBi2Se9 (x=0-4.36) |
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Authors: | Kuei-Bo Chen |
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Institution: | Department of Applied Chemistry, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan |
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Abstract: | Quaternary chalcogenides PbxSn6−xBi2Se9 (x=0-4.36) were synthesized with solid-state methods; their structures were determined from the X-ray diffraction of single crystals. PbxSn6−xBi2Se9 crystallizes in an orthorhombic space group Cmcm (No. 63); the structure features a three-dimensional framework containing slabs of NaCl-(3 1 1) type that exhibits identical layers containing seven octahedra units, which expand along the direction 0 1 0]. Each slab contains fused rectangular units that are connected to each other with M-Se contacts in a distorted octahedral environment. Calculations of the band structure, measurements of Seebeck coefficient and electrical conductivity confirm that these compounds are n-type semiconductors with small band gaps and large electrical conductivities. |
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Keywords: | Chalcogenide Homologous Lillianite Thermoelectrics |
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