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 ∞ 2 M 8 Se 13 ½ � (NaCl 111 -type) and ribbon-shape ∞ 1 M 6 Se 6 ½ � (NaCl 100 -type) units that are connected via shared Se 2À 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 À 1 • K À 2 at 550 K for Pb 4 Sb 6 Bi 4 Se 19 .
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