Transport and thermoelectric properties of Sr3(Ti0.95R0.05)2O7 (R = Ta, Nb, W) oxides

被引:4
作者
Sun, R. R. [1 ]
Qin, X. Y. [1 ]
Li, L. L. [1 ]
Li, D. [1 ]
Wang, N. N. [1 ]
Zhang, J. [1 ]
Wang, Q. Q. [1 ]
机构
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
基金
中国国家自然科学基金;
关键词
EFFECTIVE IONIC-RADII; CONDUCTIVITY; CERAMICS; SR3TI2O7;
D O I
10.1063/1.4769787
中图分类号
O59 [应用物理学];
学科分类号
摘要
The Sr-3(Ti0.95R0.05)(2)O-7 (R = Ta, Nb, W) polycrystalline compounds were fabricated, and their transport and thermoelectric properties were investigated. The results indicate that at T> 300K electrical resistivity rho for all the doped compounds increases monotonically with temperature, and basically can be described by a relation rho alpha T-M at T> similar to 650 K, with M = 1.39, 1.66, and 1.77 for R = Ta, Nb, and W, respectively, implying that at the high temperatures the acoustic phonon scattering dominates the scattering process. Although the resistivity rho of Sr-3(Ti0.95R0.05)(2)O-7 exhibits a metallic-like behavior at the temperature as low as 5K, a transition from metallic state (d rho/dT> 0) to semiconductor-like state (d rho/dT< 0) was observed at a critical low temperature similar to 41K and similar to 79K for R = Nb and W, respectively. At T< similar to 22 K, similar to 57 K, and similar to 80 K, a relation of sigma alpha T-1/2 (here conductivity sigma = 1/rho) holds for the doped compounds with R = Nb, Ta, and W, respectively, suggesting that at the low temperatures the main transport mechanism is electron-electron interaction due to the presence of disorder induced by the dopants. The thermoelectric figure of merit (ZT) for Ta-doped compound increases more steeply with increasing temperature among the three compounds and reaches 0.066 at 1000 K. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769787]
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页数:8
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