Ying LI
材料科学技术（英）
Oxide materials NaCo2O4 and (Na1-yMy)1.6Co2O4 (M=K, 0.05≤y≤0.35; M=Ca, Sr, 0.10≤y≤0.40) were prepared by a sol-gel method. Experimental results indicated that the Seebeck coefficient and the Power-factor of Na Co2O4 were improved by doping Ca and Sr but not by K. The Power-factor of NaCo2O4 is in its maximum, 1.68×10-4 W•m-1•K-2 and 11% bigger than that of the original one when the dopant fraction of Ca was 0.1. Doping Sr makes NaCo2O4 have the biggest Power-factor, 1.68×10-4 W•m-1•K-2 that is 50% bigger than the non-doping oxide. The experimental results indicate that suitable dopants and addition amounts could improve the thermoelectric properties of NaCo2O4 greatly.
关键词:
Thermoelectric materials
,
materials
,
Electric
,
proper
岳贤强
,
朱铁军
,
赵新兵
材料科学与工程学报
doi:10.14136/j.cnki.issn 1673-2812.2015.05.001
PbTe基合金是目前性能最好的中温区热电材料,近年来受到广泛关注.本文研究了载流子浓度对Na掺杂PbTe0.8Se0.2合金热电性能的影响,在Na含量为2％时,ZT可以达到1.73.在此基础上,利用Mg合金化降低材料晶格热导率的作用,进一步提升材料的热电性能.结果表明,在Mg含量为1～3％的时,ZT值在800K附近都达到了2.0左右.
关键词:
热电材料
,
P-型PbTe
,
合金化
