Li_xNa_yCoO_2的制备和热电性质  

Synthesis and thermopower measurement of Li_xNa_yCoO_2

作　　者：陈晓阳[1] 徐象繁[1] 胡荣星[1] 任之[1] 许祝安[1] 曹光旱[1] 

机构地区：[1]浙江大学物理系,杭州310027

出　　处：《物理学报》2007年第3期1627-1631,共5页Acta Physica Sinica

基　　金：教育部高等学校博士学科点专项科研基金(批准号:20040330563);国家自然科学基金(批准号:10225417)资助的课题.通讯联系人.~~

摘　　要：用固相反应方法,成功地合成了具有交互生长结构的LixNayCoO2单相多晶系列样品.热电势测量表明,该系统的室温热电势比NaxCoO2体系约高出60μV/K.基于空穴载流子具有O2p特征,提出LixNayCoO2中额外的热电势来源于氧空穴的占位熵.Polycrystalline samples of Li, Nay CoO2 with an intergrowth structure have been successfully synthesized by solid-state reaction. The measured thermopower of Lix Nay CoO2at room temperature is about 60 μV/K higher than that of Nax CoO2. Based upon the O2p characteristic for the mobile carriers, the origin of the increment in thermopower is interpreted in terms of the occupancy entropy of the O2p holes.

关 键 词：Lix NAY CoO2 热电势 热电材料 

分 类 号：O472[理学—半导体物理]