Thermoelectric properties and site-selective Rb+/K+ distribution in the K2-xRbxBi8Se13 series

Theodora Kyratsi, Duck Young Chung, John R. Ireland, Carl R. Kannewurf, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

β-K2Bi8Se13 possesses promising thermoelectric properties whereas Rb2Bi8Se13 does not. The formation of solid solutions between these two compounds was attempted to study the alkali metal distribution in the structure and its influence in the electronic properties. The structure of the K2-xRbxBi8Se13 series of solid solutions was studied and the members with 0 <x ≤ 1 were found to adopt the β-K2Bi8Se13 structure. Detailed crystallographic studies were performed for the x = 1.0 composition to examine in detail the K/Rb distribution in the lattice and the effect on the K/Bi disorder that exists in the β-K2Bi8Se13 structure. The Rb+ ions occupy exclusively one crystallographic site replacing K+. This defines RbKBi8Se13 as a new quaternary compound. Lattice parameters and band gaps are reported for the different compositions. Charge transport measurements including electrical conductivity, thermoelectric power, and Hall effect show that the materials are n-type semiconductors with increasing carrier concentration as a function of composition x.

Original languageEnglish
Pages (from-to)3035-3040
Number of pages6
JournalChemistry of Materials
Volume15
Issue number15
DOIs
Publication statusPublished - Jul 29 2003

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Solid solutions
Chemical analysis
Alkali Metals
Thermoelectric power
Hall effect
Alkali metals
Electronic properties
Lattice constants
Carrier concentration
Charge transfer
Energy gap
Ions
Semiconductor materials
Electric Conductivity

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Thermoelectric properties and site-selective Rb+/K+ distribution in the K2-xRbxBi8Se13 series. / Kyratsi, Theodora; Chung, Duck Young; Ireland, John R.; Kannewurf, Carl R.; Kanatzidis, Mercouri G.

In: Chemistry of Materials, Vol. 15, No. 15, 29.07.2003, p. 3035-3040.

Research output: Contribution to journalArticle

Kyratsi, Theodora ; Chung, Duck Young ; Ireland, John R. ; Kannewurf, Carl R. ; Kanatzidis, Mercouri G. / Thermoelectric properties and site-selective Rb+/K+ distribution in the K2-xRbxBi8Se13 series. In: Chemistry of Materials. 2003 ; Vol. 15, No. 15. pp. 3035-3040.
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