Synthesis of filled skutterudite compound La0.75Fe3CoSb12 by spark plasma sintering and effect of porosity on thermoelectric properties

被引：67

作者：

Yang, L ^{[1
]}

Wu, JS ^{[1
]}

Zhang, LT ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Key Lab Minist Educ High Temp Mat & Testing, Shanghai 200030, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 364卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

porosity; filled skutterudite compound; spark plasma sintering; thermoelectric properties;

D O I：

10.1016/S0925-8388(03)00538-3

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：

Filled skutterudite compounds La0.75Fe3CoSb12 with different porosities were synthesized using spark plasma sintering (SPS) and the Archimedes method was used to measure the porosities of the specimens. Phase constitutions and compositions of the compounds were examined by XRD and EPMA, and fracture surfaces of the compounds were observed by SEM. The effect of porosity on the thermoelectric properties was studied based on the changes in the electrical resistivity, Seebeck coefficient and thermal conductivity as a function of porosity. Our results show that the Seebeck coefficient is independent of porosity and the increase of electrical resistivity is consistent with the reduction of thermal conductivity due to scattering of carriers and phonons by pores. In addition, the thermoelectric figure of merit ZT(where T is temperature and Z is a function of the Seebeck coefficient, electrical resistivity, and thermal conductivity) of specimens with high porosity is comparable to that of specimens with low porosity. This suggests that the ZT value of La0.75Fe3CoSb12 compound does not depend significantly on the porosity. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：83 / 88

页数：6

共 16 条

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