Thermoelectric Property Study of Nanostructured p-Type Half-Heuslers (Hf, Zr, Ti)CoSb0.8Sn0.2

被引：148

作者：

Yan, Xiao ^{[1
,2
]}

Liu, Weishu ^{[1
,2
]}

Chen, Shuo ^{[1
,2
]}

Wang, Hui ^{[1
,2
]}

Zhang, Qian ^{[1
,2
]}

Chen, Gang ^{[3
]}

Ren, Zhifeng ^{[1
,2
]}

机构：

[1] Univ Houston, Dept Phys, Houston, TX 77204 USA

[2] Univ Houston, TcSUH, Houston, TX 77204 USA

[3] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

来源：

ADVANCED ENERGY MATERIALS | 2013年 / 3卷 / 09期

关键词：

thermoelectrics; half-Heuslers; ternary compositions; thermoelectric figure-of-merit; FIGURE-OF-MERIT; TRANSPORT; ENHANCEMENT; TI;

D O I：

10.1002/aenm.201200973

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Based on the best peak theromoelectric figure-of-merit value (ZT) of ca. 0.8 in Hf0.5Zr0.5CoSb0.8Sn0.2 and ca. 1 in Hf0.8Ti0.2CoSb0.8Sn0.2, the effect of Ti on thermoelectric properties is studied in (Hf, Zr, Ti)CoSb0.8Sn0.2, with the aim of further improving the ZT and reducing the usage of Hf. By either partial replacement of Hf and Zr with Ti in Hf0.5Zr0.5CoSb0.8Sn0.2 or partial replacement of Hf and Ti with Zr in Hf0.8Ti0.2CoSb0.8Sn0.2, a peak ZT of 1 is achieved at 800 degrees C in Hf0.44Zr0.44Ti0.12CoSb0.8Sn0.2. This composition has two advantages over the previous two best compositions: higher ZT than Hf0.5Zr0.5CoSb0.8Sn0.2 and less Hf than in Hf0.8Ti0.2CoSb0.8Sn0.2. A higher ZT with less Hf is very much desired since Hf is much more expensive than other constituent elements. The ZT improvement is the result of thermal conductivity reduction due to phonon scattering by both alloy and the nanostructure effect.

引用

页码：1195 / 1200

页数：6

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