Mn^(4+)掺杂对CdO多晶电、热输运性能的影响

High-temperature electric and thermal transport properties of CdO doped with Mn^(4+)

利用固相烧结法制备了Cd_(1-x)Mn_xO(x=0、0.1%、0.3%、0.5%、0.7%)多晶块体样品并研究了Mn^(4+)掺杂对CdO多晶高温电、热输运性能的影响.实验发现,随着Mn^(4+)掺杂量的增加,样品的载流子浓度和迁移率同时增大,导致其电阻率降低、塞贝克系数变大;Mn^(4+)掺杂虽然可以降低CdO的声子热导率κp,但因为电子热导率κe的大幅上升从而使样品的总热导率κ升高.本研究结果为CdO热电性能的进一步调控及优化提供了基础.

Cd1-x MnxO （x=0, 0.1%, 0.3 %, 0.5 %, 0.7 % ） ceramics were synthesized by the conventional solid state reaction method and its electric and thermal transport were both studied.With the increasing of Mn^4＋-doping, both the carrier concentration and the mobility of Cd1-x MnxO measured at room temperature increase,which leads to the significant decrease of the resistivity and increase of Seebeck coefficient S. In spite of the Mn^4＋-doping can effectively reduce the phonon thermal conductivity, the total thermal conductivity increases due to the electronic thermal conductivity increase with growing Mn^4＋ -doping.