Transport Properties of Bi2S3 and the Ternary Bismuth Sulfides KBi6.33S10 and K2Bi8S13

Baoxing Chen, Ctirad Uher, Lykourgos Iordanidis, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

180 Citations (Scopus)

Abstract

We have studied transport properties (resistivity, Hall effect, thermopower, and thermal conductivity) of Bi2S3 and two new ternary bismuth sulfides, KBi6.33S10 and K2Bi8S13, to explore their potential for thermoelectric applications. While both Bi2S3 and K2Bi8S13 display an essentially metallic conduction, KBi6.33S10 has a distinctly semiconducting character. From the Hall measurements it follows that the dominant carriers in all three compounds are electrons and that the carrier density in K2Bi8S13 is almost 2 orders of magnitude larger than in Bi2S3 and KBi6.33S10 over the whole temperature range from 4 to 300 K. While the room temperature thermopowers of KBi6.33S10 and K2Bi8S13 are comparable (∼-100 μV/K), the thermopower of Bi2S3 is a factor of 3 larger. All three compounds are poor conductors of heat in particular the thermal conductivity of KBi6.33S10 is some 25% lower than the thermal conductivity of Bi2Te3, the benchmark thermoelectric material. To make these materials useful thermoelectrics, ways must be found how to significantly increase their electrical conduction while preserving the reasonably large thermopower and low thermal conductivity.

Original languageEnglish
Pages (from-to)1655-1658
Number of pages4
JournalChemistry of Materials
Volume9
Issue number7
Publication statusPublished - Jul 1997

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Thermoelectric power
Bismuth
Transport properties
Thermal conductivity
Hall effect
Intermetallics
Carrier concentration
Temperature
Sulfides
bismuth sulfide

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

Cite this

Transport Properties of Bi2S3 and the Ternary Bismuth Sulfides KBi6.33S10 and K2Bi8S13. / Chen, Baoxing; Uher, Ctirad; Iordanidis, Lykourgos; Kanatzidis, Mercouri G.

In: Chemistry of Materials, Vol. 9, No. 7, 07.1997, p. 1655-1658.

Research output: Contribution to journalArticle

Chen, Baoxing ; Uher, Ctirad ; Iordanidis, Lykourgos ; Kanatzidis, Mercouri G. / Transport Properties of Bi2S3 and the Ternary Bismuth Sulfides KBi6.33S10 and K2Bi8S13. In: Chemistry of Materials. 1997 ; Vol. 9, No. 7. pp. 1655-1658.
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