Synthesis and Thermoelectric Properties of Nd-doped Uddlesden-Popper Phase SrO(SrTiO3)n (n-1,2) Oxides
The Nd-doped SrO(SrTiO3)n (n=1,2) bulk samples were prepared by combining a sol-gel method and spark plasma sintering (SPS).The microstructures of the precursor powders were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM),thermogravimetric (TG) and differential scanning calorimetry (DSC).The oxides of (Sr1-xNdx)n+1TinO3n+1(n=1,2;x=0.05,0.1) were prepared by solid-state reaction of the precursor powders with post-spark plasma sintering for the first time and the thermoelectric properties showed that electrical resistivity ρ and the absolute values |S| of Seebeck coefficient increased with temperature and depended on the dopant concentration,indicating a n-type degenerate semiconductor behavior.Compared with the total thermal conductivity κ (4.1-5.2 Wm-1K-1) at room temperature,the estimated electronic thermal conductivity κe (0.2-0.7 Wm-1K-1) were very small,indicating that lattice contribution was predominant in the RP phase compounds.The largest dimensionless figure of merit ZT,0.13 at 905K,was obtained the 10 at.% Nd-doped Sr3Ti2O7.This synthetic method provides a simple way to prepare thermoelectric oxides.
Ruddlesden-Popper Sol-gel Thermoelectric Spark plasma sintering
Liangliang Li Ruirui Sun Xiaoying Qin Yongfei Liu Guanglei Guo
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences,230031 Hefei, P.R. China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
94-99
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）