Abstract
AbstractMultinary 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 (NaCl111‐type) and ribbon‐shape (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.
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