Synthesis and High Temperature Thermoelectric Properties of Ca2.7-xEr0.3NaxCo4O9+δ
Polycrystalline Ca<,2.7-x>Er<,0.3>Na<,x>Co<,4>O<,9+δ> (x=0, 0.05, 0.1, 0.15) samples were prepared using a sol-gel process followed by hot-pressing technique sintering and their high-temperature thermoelectric properties were measured from 350 up to 1073K. The results showed that with the increase of the dopant amount of Na, the electrical conductivity increased, while the Seebeek coefficient and thermal conductivity decreased. The electrical conductivity was dominated by polaron hopping conductivity mechanism above about 550K and the Na<+> substitution for Ca<2+> could not change the transport mechanism. The dimensionless figure of merit ZT value reaches 0.31 for Ca<,2.55>Er<,0.3>Na<,0.15>Co<,4>O<,9+δ> at 1073K, which suggested that Ca<,2.7-x>Er<,0.3>Na<,x>Co <,4>O<,9+δ> (x=0, 0.05, 0.1, 0.15) were good potential oxides for thermoelectric application.
Co-based oxides sol-gel process electrical properties rare earths
Pei jian(裴健) Chen Gang(陈刚) Lu Dongqing(陆冬青) Teng Yujie(滕玉洁)
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
395-399
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）