TY - JOUR
T1 - Rattling guest atoms in Si, Ge, and Sn-based type-II clathrate materials
AU - Myles, Charles W.
AU - Dong, Jianjun
AU - Sankey, Otto F.
PY - 2003/9
Y1 - 2003/9
N2 - We have studied the vibrational properties of some of the compounds based on the Type II silicon, germanium, and tin-based clathrate materials using LDA electronic structure methods. The lattices in these framework materials have open cages which can contain weakly bound guest impurities, and these guests produce local ("rattling") vibrational modes. Such modes may scatter the extended, heat carrying acoustic vibrational modes of the framework, potentially reducing the thermal conductivity. We present results for the vibrational spectra of the Type II clathrate compounds Na16Cs 8Si136, Na16Cs8Ge136, and Cs24Sn136. We discuss trends in the vibrational spectra of the framework host material and of the localized, rattling frequencies of the guest modes as the host changes from Si to Ge to Sn.
AB - We have studied the vibrational properties of some of the compounds based on the Type II silicon, germanium, and tin-based clathrate materials using LDA electronic structure methods. The lattices in these framework materials have open cages which can contain weakly bound guest impurities, and these guests produce local ("rattling") vibrational modes. Such modes may scatter the extended, heat carrying acoustic vibrational modes of the framework, potentially reducing the thermal conductivity. We present results for the vibrational spectra of the Type II clathrate compounds Na16Cs 8Si136, Na16Cs8Ge136, and Cs24Sn136. We discuss trends in the vibrational spectra of the framework host material and of the localized, rattling frequencies of the guest modes as the host changes from Si to Ge to Sn.
UR - http://www.scopus.com/inward/record.url?scp=0242556816&partnerID=8YFLogxK
U2 - 10.1002/pssb.200303236
DO - 10.1002/pssb.200303236
M3 - Article
AN - SCOPUS:0242556816
VL - 239
SP - 26
EP - 34
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
SN - 0370-1972
IS - 1
ER -