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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. Ediția a 9-a, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 309.
|Materials Science and Condensed Matter Physics
Ediția a 9-a, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics" |
Chișinău, Moldova, 25-28 septembrie 2018
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 . 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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