Ternary bismuth chalcogenides for thermoelectric applications. Synthesis and charge transport properties of new compounds in the K-Bi-S system

Mercouri G. Kanatzidis*, Timothy J. McCarthy, Troy A. Tanzer, Li H. Chen, Tim Hogan, Carl R. Kannewurf, Lykourgos Iordanidis

*Corresponding author for this work

Research output: Contribution to journalConference article

5 Scopus citations

Abstract

KBi6.33S10 and K2Bi8S13 were synthesized by the direct combination of K2S/Bi2S3 at high temperature (>700 °C). The reaction of K2S/3.3Bi2S3 at 800 °C revealed the presence of a new ternary sulfide KBi6.33S10 (I) (92% yield). The structure consists of blocks of Bi2Te3 and CdI2-type units that are connected to form a three-dimensional network with K+ ions located in the channels that run along the b-axis. The same reaction but with a different ratio, at 750 °C, gave the new ternary sulfide K2Bi8S13 (II) (94% yield). The structure of the shiny rod-like crystals is closely related to that of I. As in I, it also consists of Bi2Te3 and CdI2-type fragments that connect to form K+-filled channels. The two potassium atoms and one bismuth atom are disordered over three sites. Some preliminary electrical and optical properties of these materials are discussed.

Original languageEnglish (US)
Pages (from-to)37-43
Number of pages7
JournalMaterials Research Society Symposium - Proceedings
Volume410
StatePublished - Jan 1 1996
EventProceedings of the 1995 Fall MRS Symposium - Boston, MA, USA
Duration: Nov 27 1995Nov 30 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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