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G龙行天下

新虫 (小有名气)

[求助] 关于 复合对 热电材料性能影响的问题 已有2人参与

各位做热电材料的虫友,请教一个问题:有没有做过复合对热电性能的影响研究的,我现在在做Ca3Co4O9/Bi2Ca2Co2Oy 复合材料,但是不是很清楚其机理,麻烦知道的指教一下哇,感谢
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穿越千年

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我再给你提供一张图片,描述复合材料的:

关于 复合对 热电材料性能影响的问题

更多的参考文献:
[92] J.O. Sofo, G.D. Mahan, Appl. Phys. Lett. 65 (1994) 2690.
[93] D.A. Broido, T.L. Reinecke, Phys. Rev. B 51 (1995) 13797.
[94] T.C. Harman, D.L. Spears, M.J. Manfra, J. Electron. Mater. 25 (1996) 1121.
[95] L.D. Hicks, T.C. Harman, X. Sun, M.S. Dresselhaus, Phys. Rev. B 53 (1999) R10493.
[96] T.C. Harman, P.J. Taylor, D.L. Spears, M.P. Walsh, J. Electron. Mater. 29 (2000) L1.
[97] T.C. Harman, P.J. Taylor, M.P. Walsh, B.E. LaForge, Science 279 (2002) 2229.
热电材料,相变材料,阻变材料,APT,EBSD
3楼2015-10-09 16:41:04
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穿越千年

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【答案】应助回帖

感谢参与,应助指数 +1
其实这也就是一种掺杂。我给你提供一篇参考文献,GeTe掺Bi2Te3,希望有帮助:
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.
热电材料,相变材料,阻变材料,APT,EBSD
2楼2015-10-08 16:29:32
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G龙行天下

新虫 (小有名气)

引用回帖:
2楼: Originally posted by 穿越千年 at 2015-10-08 16:29:32
其实这也就是一种掺杂。我给你提供一篇参考文献,GeTe掺Bi2Te3,希望有帮助:
Wu, D., et al. (2014). "Origin of the High Performance in GeTe-Based Thermoelectric Materials upon Bi2Te3 Doping."  ...

谢谢哈
4楼2015-10-22 17:02:40
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1529701999

木虫 (正式写手)

请问你的烧结制度是怎么确定的呢?
不忘初心,方得始终
5楼2015-10-22 21:37:23
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