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Influence of spark plasma sintering parameters on the thermoelectric properties of n-type Mg3Sb2-Mg3Bi2 solid solution materials
Mikhailova A. A.
1,2, Shcherbakova K. A.
1,2, Argunov E. V.1, Markin A. A.2, Akhmadeev A. R.
2, Dybov V. A. 2, Ananyev М. V.
3, Tabachkova N. Yu.
1
1National University of Science and Technology MISiS, Moscow, Russia
2Federal State Research and Development Institute of Rare Metal Industry (Giredmet JSC), Moscow, Russia
3School of Chemical Engineering, University of Birmingham, United Kingdom
2Federal State Research and Development Institute of Rare Metal Industry (Giredmet JSC), Moscow, Russia
3School of Chemical Engineering, University of Birmingham, United Kingdom
Email: aluona_mikhailova_style@mail.ru, m1804497@edu.misis.ru, ev.argunov@misis.ru, alexsandr918@mail.ru, albertakhmadeev1@gmail.com, dybovvlad@gmail.com, maxim.v.ananyev@gmail.com, ntabachkova@misis.ru
Samples based on the Mg3Sb2-Mg3Bi2 solid solution were obtained by mechanochemical synthesis followed by spark plasma sintering. The regularities of the influence of compaction process parameters on the electrical and thermal physical properties of the samples were identified. It was established that the application of a two-stage heating regime promotes an increase in electrical conductivity up to 325 S/cm at 390 K, while simultaneously ensuring a reduction in lattice thermal conductivity to 0.49 W/(m · K). Collectively, these changes enable achieving a maximum thermoelectric figure of merit zT of 1.38 at 732 K. Keywords: Thermoelectric materials, Zintl phases, Seebeck coefficient, electrical conductivity, thermal conductivity.
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