Thermoelectric properties and cost optimization of spark plasma sintered n-type Si0.9Ge0.1 - Mg2Si nanocomposites

SCRIPTA MATERIALIA

卷:146

Article

Usenko, Andrey¹  Moskovskikh, Dmitry¹  Korotitskiy, Andrey¹  Gorshenkov, Mikhail¹  Zakharova, Elena¹  Fedorov, Aleksandr^2,3  Parkhomenko, Yury¹  Khovaylo, Vladimir^1,4 

[1] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

[2] Siberian Fed Univ, Krasnoyarsk 660041, Russia

[3] Kirensky Inst Phys, Krasnoyarsk 660036, Russia

[4] Natl Res South Ural State Univ, Chelyabinsk 454080, Russia

关键词: Thermoelectric materials;    Spark plasma sintering;    Mechanical alloying;    Silicon;    Germanium;    Magnesium silicide;    Nanocomposite;   

DOI  :  10.1016/j.scriptamat.2017.12.019

来源: Elsevier

【 摘 要 】

We report on thermoelectric properties of low Ge content n -type Si0.9Ge0.1-Mg2Si nanocomposite. Introduction of the Mg2Si phase into a SiGe matrix resulted in a dramatic drop of the lattice thermal conductivity beyond the previously reported lowest limit for SiGe alloys due to intensification of phonon scattering on SiGe-Mg2Si grain boundaries. For a sample doped with 1 at.% of Mg2Si, the peak value of thermoelectric figure of merit ZT reached similar to 0.8 at 800 degrees C. Sintered nanocomposites still exhibit high thermoelectric performance while being almost two times cheaper than Si0.8Ge0.2. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights

【 授权许可】

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