A new thermoelectric material: CsBi4Te6

Duck Young Chung, Tim P. Hogan, Melissa Rocci-Lane, Paul Brazis, John R. Ireland, Carl R. Kannewurf, Marina Bastea, Ctirad Uher, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

The highly anisotropic material CsBi4Te6 was prepared by the reaction of Cs/Bi2Te3 around 600 °C. The compound crystallizes in the monoclinic space group C2/m with a = 51.9205(8) Å, b = 4.4025(1) Å, c = 14.5118(3) Å, β = 101.480(1)°, V = 3250.75(11) Å3, and Z = 8. The final R values are R1 = 0.0585 and wR2 = 0.1127 for all data. The compound has a 2-D structure composed of NaCl-type [Bi4Te 6] anionic layers and Cs+ ions residing between the layers. The [Bi4Te6] layers are interconnected by Bi-Bi bonds at a distance of 3.2383(10) Å. This material is a narrow gap semiconductor. Optimization studies on the thermoelectric properties with a variety of doping agents show that the electrical properties of CSBi 4Te6 can be tuned to yield an optimized thermoelectric material which is promising for low-temperature applications. Sbl3 doping resulted in p-type behavior and a maximum power factor of 51.5 μW/cm·K2 at 184 K and the corresponding ZT of 0.82 at 225 K. The highest power factor of 59.8 μW/cm·K2 at 151 K was obtained from 0.06% Sb-doped material. We report here the synthesis, physicochemical properties, doping characteristics, charge-transport properties, and thermal conductivity. Also presented are studies on n-type CsBi 4Te6 and comparisons to those of p-type.

Original languageEnglish
Pages (from-to)6414-6428
Number of pages15
JournalJournal of the American Chemical Society
Volume126
Issue number20
DOIs
Publication statusPublished - May 26 2004

    Fingerprint

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Chung, D. Y., Hogan, T. P., Rocci-Lane, M., Brazis, P., Ireland, J. R., Kannewurf, C. R., Bastea, M., Uher, C., & Kanatzidis, M. G. (2004). A new thermoelectric material: CsBi4Te6. Journal of the American Chemical Society, 126(20), 6414-6428. https://doi.org/10.1021/ja039885f