학술논문
Synthesis and Characterization of Multinary Selenides A4 B10 Se19 (A=Sn, Pb; B=Sb, Bi).
Document Type
Article
Source
Subject
*SELENIDES
*THERMOELECTRIC materials
*X-ray powder diffraction
*SEEBECK coefficient
*X-ray diffraction measurement
*ELECTRONIC structure
*TIN
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Language
ISSN
0044-2313
Abstract
Multinary selenides A4B10Se19 (A=Sn/Pb; B=Sb/Bi), including Sn4Bi10Se19, Pb4Sb6.71Bi3.29Se19, and Pb4Sb3.43Bi6.57Se19, were prepared by solid‐state reactions. These compounds adopt the Felbertalite structure type that crystallizes in the monoclinic space group C2/m (No. 12). Single‐crystal and powder X‐ray diffraction measurements studied the crystal structure and site preference of metal sites. They exhibit stacking of stepped layers∞2M8Se13 ${{}_{\infty }{}^{2}\left[{M}_{8}{Se}_{13}\right]}$ (NaCl111‐type) and ribbon‐shape ∞1M6Se6 ${{}_{\infty }{}^{1}\left[{M}_{6}{Se}_{6}\right]}$ (NaCl100‐type) units that are connected via shared Se2− ions. Electronic structure calculations indicated semiconducting properties and were verified by temperature‐dependent conductivity and Seebeck coefficient measurements. The thermoelectric properties show a maximum power factor of 1.06 μW ⋅ m−1 ⋅ K−2 at 550 K for Pb4Sb6Bi4Se19. [ABSTRACT FROM AUTHOR]