Stracture and thermoelectric properties of the new quaternary tin selenide K(1-x)Sn(5-x)Bi(11+x)Se22

Antje Mrotzek, Duck Young Chung, Tim Hogan, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Silver colored ribbon-like crystals of K(1-x)Sn(5-x)Bi(11+x)Se22 (x≃0.33) were prepared by direct combination of K2Se, Bi2Se3, Sn and Se at 800 °C. A structure determination was carried out for K0. 66Sn4.82Bi11.18Se22. Bi2Te3-type and NaCl-type building units are connected to form a new kind of three-dimensional anionic framework with K+ filled tunnels. The building units are assembled from distorted, edge- sharing (Bi,Sn)Se6 octahedra. Bi and Sn atoms are disordered over all metal sites of the chalcogenide network while the K site is only one third occupied. The charge transport measurements of K0.66Sn4.82Bi11.18Se22 at room temperature reveal an electrical conductivity of 450 S cm-1 and a thermopower of -43 μV K-1. The thermal conductivity is 1.5 W m-1 K-1. An optical band gap of approximately 0.12 eV was determined at room temperature. K0.66Sn4.82Bi11.18Se22 melts congruently at 680 °C.

Original languageEnglish
Pages (from-to)1667-1672
Number of pages6
JournalJournal of Materials Chemistry
Volume10
Issue number7
DOIs
Publication statusPublished - 2000

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Tin
selenides
tin
Thermoelectric power
Optical band gaps
room temperature
Silver
ribbons
tunnels
Charge transfer
Thermal conductivity
Tunnels
thermal conductivity
Metals
silver
Atoms
Temperature
Crystals
electrical resistivity
metals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Materials Chemistry

Cite this

Stracture and thermoelectric properties of the new quaternary tin selenide K(1-x)Sn(5-x)Bi(11+x)Se22. / Mrotzek, Antje; Chung, Duck Young; Hogan, Tim; Kanatzidis, Mercouri G.

In: Journal of Materials Chemistry, Vol. 10, No. 7, 2000, p. 1667-1672.

Research output: Contribution to journalArticle

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