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- W1996711799 abstract "A series of LaFeAsO1−xFx (x = 0–0.225) oxyarsenides have been synthesized by a solid-state reaction method in order to optimize electrical transport properties through appropriate F doping. Both electrical resistivity and Seebeck coefficient of undoped LaFeAsO show an anomaly at about 150 K, which is related to a structural phase and/or spin-density-wave (SDW) transition. Seebeck coefficient seems to be determined by two competitive factors: it is enhanced by suppressing the structural phase and/or SDW transition, and reduced by increasing carrier concentration. Seebeck coefficient is significantly enhanced just after suppressing the anomaly, and the maximum Seebeck coefficient reached −142 μV/K for the sample with F doping x = 0.075 from −58 μV/K for undoped LaFeAsO, and then decreased with further increasing carrier concentration through F doping. Meanwhile, the electrical resistivity is decreased with increasing F doping, resulting in a maximum power factor value of 1.2 mW/mK2 at 80 K for polycrystalline LaFeAsO0.85F0.15 sample, this value is the same order as that of the best low temperature thermoelectric Bi88Sb12 compounds, and could be significantly higher in single crystals." @default.
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- W1996711799 date "2010-10-01" @default.
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- W1996711799 title "Electrical transport properties of F-doped LaFeAsO oxypnictide" @default.
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- W1996711799 doi "https://doi.org/10.1016/j.jallcom.2010.08.138" @default.
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