The structural and electronic properties of type-I clathrates Ba8CuxGa16−xSn30 from first-principle calculations
The structural and electronic properties of type-I clathrates Ba8CuxGa16−xSn30 from first-principle calculations
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第一性原理计算的 I 型包合物 Ba8CuxGa16−xSn30 的结构和电子性质
DOI:
10.1007/s12648-012-0107-1
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发表时间:
2012
影响因子:
2
通讯作者:
H. Ruan
中科院分区:
文献类型:
--
作者:
D. Li;L. Fang;S. Deng;K. Kang;W. H. Wei;H. Ruan
The effects of Cu–doping concentration on the structural and electronic properties of Ba8CuxGa16−xSn30(0 ≤x≤ 3) type-I clathrate compounds have been investigated by first-principle calculations. Starting with the stable structures of the type-I clathrate semiconductors Ba8Ga16Sn30containing no Ga–Ga bonds, we have constructed unit cells of Ba8CuxGa16−xSn30. The dependence of the structural and electronic properties of these compounds withxis discussed. The results reveal that the interaction between the rattler atom and the cage is affected by Cu doping, which suggests that Cu doping may play a role on the thermal conductivity. It is shown that the Ba8Ga16Sn30is an intrinsic semiconductor, but Cu doping leads top-type transport characteristics. Detailed analysis of the electronic structures for Cu-doped clathrates imply that Cu 3delectrons may display both itinerant and localized features and the electronic states near the top of the valence band are modified by the Cu 3dstates. The number of states near the Fermi level is increased by the coupling ofsp–d, which may lead to reduced stability of the structure.
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影响因子:
4
作者:
Avila, M. A.;Suekuni, K.;Takabatake, T.
通讯作者:
Takabatake, T.
影响因子:
3.7
作者:
K. Suekuni;Y. Takasu;T. Hasegawa;N. Ogita;M. Udagawa;M. Avila;T. Takabatake
通讯作者:
K. Suekuni;Y. Takasu;T. Hasegawa;N. Ogita;M. Udagawa;M. Avila;T. Takabatake
影响因子:
3.7
作者:
D. Connétable
通讯作者:
D. Connétable
影响因子:
3.7
作者:
M. Kozina;F. Bridges;Y. Jiang;M. Avila;K. Suekuni;T. Takabatake
通讯作者:
M. Kozina;F. Bridges;Y. Jiang;M. Avila;K. Suekuni;T. Takabatake
影响因子:
56.9
作者:
Heremans, Joseph P.;Jovovic, Vladimir;Snyder, G. Jeffrey
通讯作者:
Snyder, G. Jeffrey