On the optical properties of thermoelectric alkali metal chalcogenide compounds

E. Hatzikraniotis, Th Kyratsi, T. Zorba, K. M. Paraskevopoulos, M. G. Kanatzidis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Solid solutions of K2Bi8-xSbxSe 13 is an interesting series of complex bismuth-chalcogenide compounds, which are attractive for thermoelectric investigations. The highly anisotropic structure in these compounds results in needle-like morphology along the b- crystallographic axis, leaving structural tunnels where K+ ions reside. The complex electronic structure that arises from a large and low symmetry unit cell and the weakly bound K+ ions, lead to high Seebeck coefficient, highly anisotropic electrical properties and very low thermal conductivity. Reflectivity spectra in the FIR region are presented for several members in the Sb-rich (x≥6) side. Optical investigations are carried out on crystalline and pelletized samples. The received spectra are analyzed, examined comparatively and discussed. Results indicate that upon Bi/Sb substitution in the Sb-rich region, phonons develop a mixed-mode behavior in the FIR spectral region.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages269-274
Number of pages6
Publication statusPublished - May 8 2006
Event2005 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Nov 28 2005Dec 1 2005

Publication series

NameMaterials Research Society Symposium Proceedings
Volume886
ISSN (Print)0272-9172

Other

Other2005 Materials Research Society Fall Meeting
CountryUnited States
CityBoston, MA
Period11/28/0512/1/05

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ASJC Scopus subject areas

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

Cite this

Hatzikraniotis, E., Kyratsi, T., Zorba, T., Paraskevopoulos, K. M., & Kanatzidis, M. G. (2006). On the optical properties of thermoelectric alkali metal chalcogenide compounds. In Materials Research Society Symposium Proceedings (pp. 269-274). (Materials Research Society Symposium Proceedings; Vol. 886).