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 language | English |
|---|---|
| Title of host publication | Materials Research Society Symposium Proceedings |
| Pages | 269-274 |
| Number of pages | 6 |
| Volume | 886 |
| Publication status | Published - 2006 |
| Event | 2005 Materials Research Society Fall Meeting - Boston, MA, United States Duration: Nov 28 2005 → Dec 1 2005 |
Other
| Other | 2005 Materials Research Society Fall Meeting |
|---|---|
| Country | United States |
| City | Boston, MA |
| Period | 11/28/05 → 12/1/05 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
Cite this
On the optical properties of thermoelectric alkali metal chalcogenide compounds. / Hatzikraniotis, E.; Kyratsi, Th; Zorba, T.; Paraskevopoulos, K. M.; Kanatzidis, Mercouri G.
Materials Research Society Symposium Proceedings. Vol. 886 2006. p. 269-274.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - On the optical properties of thermoelectric alkali metal chalcogenide compounds
AU - Hatzikraniotis, E.
AU - Kyratsi, Th
AU - Zorba, T.
AU - Paraskevopoulos, K. M.
AU - Kanatzidis, Mercouri G
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33646197933&partnerID=8YFLogxK
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M3 - Conference contribution
SN - 1558998403
SN - 9781558998407
VL - 886
SP - 269
EP - 274
BT - Materials Research Society Symposium Proceedings
ER -