Bi-Sb layers and wires for magneto- thermoelectric applications

Nikolaeva Albina; Konopko Leonid; Bodyul P.; Popov Ivan; Moloshnik Eugen

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2022-12-09 14:11

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537.32+621.315.5+621.38 (1)

Электричество. Электрический ток. Электрокинетика (90)

Электротехника (1153)

SM ISO690:2012

NIKOLAEVA, Albina, KONOPKO, Leonid, BODYUL, P., POPOV, Ivan, MOLOSHNIK, Eugen. Bi-Sb layers and wires for magneto- thermoelectric applications. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 309.

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Materials Science and Condensed Matter Physics
Ediția 9, 2018

Conferința "International Conference on Materials Science and Condensed Matter Physics"
9, Chișinău, Moldova, 25-28 septembrie 2018

Bi-Sb layers and wires for magneto- thermoelectric applications

CZU: 537.32+621.315.5+621.38

Pag. 309-309

Nikolaeva Albina¹, Konopko Leonid¹, Bodyul P.¹², Popov Ivan¹, Moloshnik Eugen¹

¹ Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu",
² Technical University of Moldova

Proiecte:

15.817.02.09A Micro şi nanostructuri funcţionale din semiconductori organici şi anorganici pentru microelectronică. Convertoare de energie.

Disponibil în IBN: 14 februarie 2019

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Thermoelectric energy conversion efficiency is defined as ZT = S² σ /χT, where S is the Seebeck coefficient, = is the electrical conductivity, χ is the thermal conductivity, and T is the absolute temperature. This study is aimed at increasing the thermoelectric figure of merit ZT to maximize the power factor and minimize the thermal conductivity. Since undoped Bi–12at%Sb alloys are of n-type, the possibility of obtaining p-type Bi–Sb alloys (bulk samples and layers) with a high figure of merit by the addition of acceptor impurities and the application of a transverse magnetic field has been explored. The mechanical exfoliation method was used to obtain Bi1-xSbx layers and the liquid-phase casting method (Ulitovsky–Tailor) was used to prepare wires [1]. In this paper, we present the results of measurements of transport effects in undoped and doped Bi–12at%Sb–0.001at%Pb alloy bulk samples, single-crystal layers, and glass-insulated wires. The measurements included the electrical resistivity, Seebeck coefficient S, and the Nernst coefficient as a function of crystallographic direction, temperature, and magnetic field direction. The values and temperature dependence of power factor α² σ, which were calculated from experimental data in a transverse magnetic field, showed a considerable increase in this parameter in the wires and layers compared with the bulk samples in a magnetic field of 0.3 T [2, 3]. A combination of the Peltier and magneto-Peltier effects in Bi–Sb layers and wires provides a stronger cooling both from room temperature and from 100 K than the cooling in bulk alloys of the same composition.

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