YbyCo4Sb12/Yb2O3热电复合材料的高温稳定性研究

doi:10.3724/SP.J.1077.2014.13261

无机材料学报 ›› 2014, Vol. 29 ›› Issue (2): 209-214.DOI: 10.3724/SP.J.1077.2014.13261 CSTR: 32189.14.SP.J.1077.2014.13261

Yb_yCo₄Sb₁₂/Yb₂O₃热电复合材料的高温稳定性研究

丁娟^1,2, 刘睿恒¹, 顾辉², 陈立东¹

(中国科学院上海硅酸盐研究所1. 中国科学院能量转换材料重点实验室; 2. 高性能陶瓷和超微结构国家重点实验室, 上海200050)

收稿日期:2013-05-10 修回日期:2013-05-31 出版日期:2014-02-20 网络出版日期:2014-01-17
作者简介:丁娟(1983-), 女, 博士研究生. E-mail: dingjuan@mail.sic.ac.cn
基金资助:
国家自然科学基金重点项目(11179013)

Study on the High Temperature Stability of Yb_yCo₄Sb₁₂/Yb₂O₃ Composite Thermoelctric Material

DING Juan^1,2, LIU Rui-Heng¹, GU Hui², CHEN Li-Dong¹

(1. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2013-05-10 Revised:2013-05-31 Published:2014-02-20 Online:2014-01-17
About author:DING Juan. E-mail: dingjuan@mail.sic.ac.cn
Supported by:
National Natural Science Foundation of China (11179013)

摘要/Abstract

摘要： 采用高温熔融/热处理并结合SPS烧结工艺制备了Yb名义组分为0.6的Yb_yCo₄Sb₁₂/Yb₂O₃填充方钴矿复合材料, 纳米或亚微米Yb₂O₃颗粒主要分散在方钴矿晶界上。研究了873 K下低氧分压高温处理对样品的热电性能与微结构的影响。热处理后样品的电导率、赛贝克系数、热导率基本保持不变, 块体材料内部纳米与亚微米尺度微观结构未发生明显变化, 未发现填充方钴矿结构中的Yb元素的“大量逸出”与氧化, 材料的高温ZT值保持在1.2左右。TEM观察发现Yb_yCo₄Sb₁₂填充方钴矿晶粒内存在大量的位错, 由位错产生的内应力有可能对Yb离子从晶格孔洞的逸出以及Yb离子和O离子的扩散产生阻碍作用, 从而抑制了在高温低氧分压下Yb_yCo₄Sb₁₂的内氧化, 使得高Yb含量的Yb_yCo₄Sb₁₂/Yb₂O₃复合材料的高温稳定性比低Yb含量填充方钴矿材料更佳。

关键词: 热电转换, 方钴矿, 纳米复合, 结构演化

Abstract: Yb_yCo₄Sb₁₂/Yb₂O₃ filled skutterudite composite with nominal compositions of y=0.6 was synthesized, in which the Yb₂O₃ particles in nanometer and/or micrometer sizes dispersed mainly on the grain boundary. The high temperature stability of the composite was investigated. It was found that the thermoelectric properties (electrical conductivity, Seebeck coefficient and thermal conductivity) and the microstructure features (grain size, amount and dispersion of oxide particles) , Yb filling fractions were almost unchanged after heat treatment at 873 K for 30 d, resulting in almost unchanged maximum ZT values of about 1.2. A large number of dislocations were observed in the grain interior. The stress generated by dislocations is considered the major factor to effectively prevent the “escape” of Yb ions from the Sb-cages and to block the migration of the Yb²⁺ ions and O₂- ions, thus preventing the generation of oxide particles.

Key words: thermoelectric, skutterudite, nano composite, microstructural evolution

中图分类号:

TQ174

丁娟, 刘睿恒, 顾辉, 陈立东 . Yb_yCo₄Sb₁₂/Yb₂O₃热电复合材料的高温稳定性研究[J]. 无机材料学报, 2014, 29(2): 209-214.

DING Juan, LIU Rui-Heng, GU Hui, CHEN Li-Dong. Study on the High Temperature Stability of Yb_yCo₄Sb₁₂/Yb₂O₃ Composite Thermoelctric Material[J]. Journal of Inorganic Materials, 2014, 29(2): 209-214.

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Yb_yCo₄Sb₁₂/Yb₂O₃热电复合材料的高温稳定性研究

Study on the High Temperature Stability of Yb_yCo₄Sb₁₂/Yb₂O₃ Composite Thermoelctric Material

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