Improvement Mechanism of Thermoelectric Materials by Dispersion of Fine Particles.

细颗粒分散的热电材料改进机制。

• 批准号: 09450273
• 负责人: NAGAI Hiroshi
• 金额: $ 6.78万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450273/
• 关键词: Thermoelectric materials; mechanical alloying; nano-composite; thermoelectric power; electrical resistivity; thermal conductivity; powder metallurgy; sintered materials; 燃結材料; β-FeSi_2; 粉末治金

The performance of the thermoelectric materials is represented by the figure of merit Z : Z=αィイD12ィエD1/ρκ, where α is Seebeck coefficient, ρ is electrical resistivity, and κ is thermal conductivity. In order to obtain a high figure of merit, a large Seebeck coefficient and low electrical resistivity is required, as well as a low thermal conductivity. The effects of dispersion of fine particles on the thermoelectric propeties are investigated in this study.The results obtained are as follows :(1)Thermoelectric materials (β-FeSiィイD22ィエD2 and CoSbィイD23ィエD2) with dispersion of fine particles are obtained by mechanical alloying (MA) and hot-pressing method. (2) β-FeSiィイD22ィエD2 with ultra-fine SiC dispersion was obtained by MA of FeSiィイD22ィエD2, Si and C powders. The performance was markedly improved by decreasing the thermal conductivity. (3) Electrical resitivity and thermal conductivity of CoSbィイD23ィエD2 were markedly decreased by the dispersion of FeSbィイD22ィエD2 and NiSbィイD22ィエD2 particles with low resistivity. (4) Hall effect measurements revealed that dispersion of second phases differently affects the thermoelectric properties of n-type and p-type materials due to the electronic interaction between the matrix and the second phases.

热电材料的性能用品质因数Z表示：Z=αD12D1/ρκ，其中α是塞贝克系数，ρ是电阻率，κ是热导率，为了获得高的品质因数，需要大的值。需要塞贝克系数和低电阻率，以及低导热率。本研究研究了细颗粒分散对热电性能的影响。获得的结果如下。 ：（1）通过机械合金化（MA）和热压法获得细颗粒分散的热电材料（β-FeSiD22D2和CoSbD23D2）。（2）通过MA法获得超细颗粒分散的β-FeSi D22D2。 FeSiD22D2、Si 和 C 粉末通过降低热量显着提高了性能。 (3) 低电阻率 FeSbD22D2 和 NiSbD22D2 颗粒的分散显着降低了 CoSbD23D2 的电阻率和导热率。 (4) 霍尔效应测量表明，第二相的分散对 n 型和 p 型的热电性能有不同的影响。 -型材料归因于基体和第二相之间的电子相互作用。

项目成果

H. Nagai: "Thermoelectric Properties of β-FeSiィイD22ィエD2 with Dispersion of SiC by Mechanical Alloying."Proc. of 17th Intl. Conf. on Thermoelectrics.. ICT'98. 374-377 (1998)

H. Nagai：“通过机械合金化分散 SiC 的热电性能”。第 17 届国际热电会议论文集。ICT98（1998 年）。

勝山茂: "Effect of substitution of La by alkaline earth metal on the thermoelectric properties and the phase stability of γ-La_3S_4." J. Appl. Phys.82・11. 5513-5519 (1997)

Shigeru Katsuyama：“碱土金属取代 La 对 γ-La_3S_​​4 的热电性能和相稳定性的影响。J. Appl. 5513-5519 (1997)”

S. Katsuyama: "Effect of MG on the Thermoelectric Properties of CoSbィイD23ィエD2."J. Jpn. Soc. Powder & Powder Met.. 44(1). 29-33 (1997)

S. Katsuyama：“MG 对 CoSbD23D2 热电性能的影响”，J. Soc. 29-33 (1997)。

S. Katsuyama: "Theroelectric properties of the skutterudite CoィイD21-ィエD2xFexSbィイD23ィエD2 system."J. Appl. Physics.. 84(12). 6708-6712 (1998)

S. Katsuyama：“方钴矿系统的热电特性。”J. Appl. 84(12) (1998)。

伊藤幹夫: "Preparation of Iron Disilicide by Sintering with Cu Addition and Their Thermoelectric Properties"Proc. Of ICT99. 18・1. 452-455 (1999)

Mikio Ito：“通过添加 Cu 进行烧结制备二硅化物及其热电性能”Proc. 18・1 (1999)。