CsMBi<sub>3</sub>Te<sub>6</sub> and CsM<sub>2</sub>Bi<sub>3</sub>Te<sub>7</sub> (M = Pb, Sn): New Thermoelectric Compounds with Low-Dimensional Structures
Kuei‐Fang Hsu(Michigan State University), Duck Young Chung(Michigan State University), Sangeeta Lal(Michigan State University), Antje Mrotzek(Michigan State University), Theodora Kyratsi(Michigan State University), Tim Hogan(Michigan State University), Mercouri G. Kanatzidis(Michigan State University)
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Abstract
The new materials CsPbBi(3)Te(6) and CsPb(2)Bi(3)Te(7) were discovered through reactions of CsBi(4)Te(6) with PbTe, whereas the isostructural materials CsSnBi(3)Te(6) and CsSn(2)Bi(3)Te(7) were discovered through corresponding reactions with SnTe. The compounds can also be prepared from stoichiometric mixtures of Cs(2)Te, Pb (Sn), Bi, and Te. The crystal structures show a layered architecture of NaCl-type slabs alternating with layers of Cs atoms. This group of compounds offers a new quaternary system, Cs-M-Bi-Te (M = Pb and Sn), available for thermoelectric investigations, including fine-tuning of compositions and doping.
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