High thermoelectric performance of triple-filled n-type skutterudites (Sr,Ba,Yb)yCo4Sb12

被引：68

作者：

Zhang, L. ^{[1
,3
]}

Grytsiv, A. ^{[1
]}

Rogl, P. ^{[1
]}

Bauer, E. ^{[2
]}

Zehetbauer, M. ^{[3
]}

机构：

[1] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria

[2] TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria

[3] Res Grp Phys Nanostructured Mat, A-1090 Vienna, Austria

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2009年 / 42卷 / 22期

关键词：

TRANSPORT-PROPERTIES; PHYSICAL-PROPERTIES;

D O I：

10.1088/0022-3727/42/22/225405

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The influences of single, double and triple filling of Yb, Ba and Sr in CoSb3 on thermoelectric performance were evaluated. A significant suppression of lattice thermal conductivity kappa(1) is achieved by the increase in the number of filler elements. The highest power factor appears in triple-filled (Ba0.1Yb0.1)(0.25)(Sr0.1Yb0.1)(0.75)Co4Sb12, whereas single-filled Ba0.23Co4Sb12 has higher S-2/rho than double-filled (Ba,Yb)(0.2)Co4Sb12 forming a sequence S-2/rho (triple filling) > S-2/rho (single filling) > S-2/rho (double filling). However, the respective figures of merit follow a sequence S-2/rho((triple filling)) > S-2/rho((double filling)) > S-2/rho ((single filling)) proving a strong correlation with kappa(1) that appears to be a predominant factor in the efficiency of filled skutterudites. Thus,. and ZT increase with increasing lattice thermal resistivity (1/kappa(1)) and maximum efficiencies may be obtained for 1/kappa(1) > 0.2 cm K mW(-1).

引用

页数：9

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