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G龍行天下新蟲 (小有名氣)
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[求助]
關(guān)于 復合對 熱電材料性能影響的問題 已有2人參與
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各位做熱電材料的蟲友,請教一個問題:有沒有做過復合對熱電性能的影響研究的,我現(xiàn)在在做Ca3Co4O9/Bi2Ca2Co2Oy 復合材料,但是不是很清楚其機理,麻煩知道的指教一下哇 ,感謝 |
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其實這也就是一種摻雜。我給你提供一篇參考文獻,GeTe摻Bi2Te3,希望有幫助: Wu, D., et al. (2014). "Origin of the High Performance in GeTe-Based Thermoelectric Materials upon Bi2Te3 Doping." J Am Chem Soc 136(32): 11412-11419. As a lead-free material, GeTe has drawn growing attention in thermoelectrics, and a figure of merit (ZT) close to unity was previously obtained via traditional doping/alloying, largely through hole carrier concentration tuning. In this report, we show that a remarkably high ZT of approximately 1.9 can be achieved at 773 K in Ge0.87Pb0.13Te upon the introduction of 3 mol % Bi2Te3. Bismuth telluride promotes the solubility of PbTe in the GeTe matrix, thus leading to a significantly reduced thermal conductivity. At the same time, it enhances the thermopower by activating a much higher fraction of charge transport from the highly degenerate Sigma valence band, as evidenced by density functional theory calculations. These mechanisms are incorporated and discussed in a three-band (L + Sigma + C) model and are found to explain the experimental results well. Analysis of the detailed microstructure (including rhombohedral twin structures) in Ge0.87Pb0.13Te + 3 mol % Bi2Te3 was carried out using transmission electron microscopy and crystallographic group theory. The complex microstructure explains the reduced lattice thermal conductivity and electrical conductivity as well. |

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