Thermoelectric properties and cost optimization of spark plasma sintered n-type Si0.9Ge0.1 - Mg2Si nanocomposites. (15th March 2018)

• Record Type: Journal Article
• Authors: Usenko, Andrey; Moskovskikh, Dmitry; Korotitskiy, Andrey; Gorshenkov, Mikhail; Zakharova, Elena; Fedorov, Aleksandr; Parkhomenko, Yury; Khovaylo, Vladimir
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 295
• Page End: 299
• Publication Date: 2018-03-15
• Subjects: Thermoelectric materials -- Spark plasma sintering -- Mechanical alloying -- Silicon -- Germanium -- Magnesium silicide -- Nanocomposite; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.12.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report on thermoelectric properties of low Ge content n -type Si0.9 Ge0.1 –Mg2 Si nanocomposite. Introduction of the Mg2 Si 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–Mg2 Si grain boundaries. For a sample doped with 1 at.% of Mg2 Si, the peak value of thermoelectric figure of merit ZT reached ~ 0.8 at 800 °C. Sintered nanocomposites still exhibit high thermoelectric performance while being almost two times cheaper than Si0.8 Ge0.2 . Graphical abstract: Image 1