Creation of Yb2O3 Nanoprecipitates Through an Oxidation Process in Bulk Yb-Filled Skutterudites

被引：18

作者：

Ding, Juan ^{[1
,2
]}

Gu, Hui ^{[1
]}

Qiu, Pengfei ^{[3
]}

Chen, Xihong ^{[3
]}

Xiong, Zhen ^{[3
]}

Zheng, Qiang ^{[1
]}

Shi, Xun ^{[3
]}

Chen, Lidong ^{[3
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2013年 / 42卷 / 03期

关键词：

Thermoelectric; filled skutterudite; nanocomposites; HIGH-THERMOELECTRIC PERFORMANCE; TRANSPORT-PROPERTIES; HIGH FIGURE; MERIT; COMPOSITES;

D O I：

10.1007/s11664-012-2370-5

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An approach to introduce in situ nanoprecipitates into bulk filled skutterudites is developed through controlling the oxidation process of the fillers. Yb0.3Co4Sb12 is selected as the base material, and prolonged oxidation at high temperatures in sealed quartz tubes under a low pressure of oxygen leads to the formation of Yb2O3 nanoinclusions. Transmission electron microscopy shows that the Yb2O3 nanoprecipitates are created within the skutterudite crystal grains through an internal oxidation mechanism. With increased time of oxidation, the amount of Yb2O3 nanoprecipitates is increased and the nanoprecipitates are more uniformly distributed in the matrix. For the samples oxidized for 10 days, the lattice thermal conductivity is reduced by about 19% at 850 K compared with the Yb0.3Co4Sb12 matrix. The reduction in the lattice thermal conductivity originates from additional phonon scattering by the Yb2O3 nanoprecipitates, leading to a maximum ZT of 1.3.

引用

页码：382 / 388

页数：7

共 25 条

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