TY - GEN
T1 - Direct and indirect effects of filling on electronic structure of skutterudites
AU - Wee, Daehyun
AU - Kozinsky, Boris
AU - Fomari, Marco
AU - Marzari, Nicola
PY - 2009
Y1 - 2009
N2 - We perform ab-initio computations to investigate the family of CoSb 3 skutterudites in an attempt to develop deeper understanding of the effect of fillers. Primary focus is on Ba-filled CoSb3 systems, while Ca and Sr-filled systems are also compared for checking consistency. We analyze both global and local structural effects of filling. We show the specific deformation of Sb network introduced by the filler. Such a deformation is localized around the filler site since soft Sb rings accommodate the distortion. Rearrangement of Sb atoms affects the band structures, and we perform additional analysis to clarify the effect of volume on the band gap. Phonon dispersions are briefly discussed, and filler-dominated vibrations are identified. These modes form the first optical modes at Γ. They manifest themselves in phonon dispersion curves as flat lines, showing that they are localized, while filler vibration is strongly coupled with nearby Sb atoms.
AB - We perform ab-initio computations to investigate the family of CoSb 3 skutterudites in an attempt to develop deeper understanding of the effect of fillers. Primary focus is on Ba-filled CoSb3 systems, while Ca and Sr-filled systems are also compared for checking consistency. We analyze both global and local structural effects of filling. We show the specific deformation of Sb network introduced by the filler. Such a deformation is localized around the filler site since soft Sb rings accommodate the distortion. Rearrangement of Sb atoms affects the band structures, and we perform additional analysis to clarify the effect of volume on the band gap. Phonon dispersions are briefly discussed, and filler-dominated vibrations are identified. These modes form the first optical modes at Γ. They manifest themselves in phonon dispersion curves as flat lines, showing that they are localized, while filler vibration is strongly coupled with nearby Sb atoms.
UR - http://www.scopus.com/inward/record.url?scp=74549124236&partnerID=8YFLogxK
U2 - 10.1557/proc-1166-n05-07
DO - 10.1557/proc-1166-n05-07
M3 - Conference contribution
AN - SCOPUS:74549124236
SN - 9781605111391
T3 - Materials Research Society Symposium Proceedings
SP - 115
EP - 120
BT - Materials and Devices for Thermal-to-Electric Energy Conversion
PB - Materials Research Society
T2 - 2009 MRS Spring Meeting: Materials and Devices for Thermal-to-Electric Energy Conversion
Y2 - 13 April 2009 through 17 April 2009
ER -