Effect of chemical composition on the thermoelectric properties of Pb-Ag-Te compounds
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ACHIMOVA, Elena; GORICHOK, I.; KRYSKOV, Tezarii; LYUBA, T.; MAZYAR, D.; MESHALKIN, Alexei; OPTASYUK, S.; RACHKOVSKY, O.; TKACHUK, I.. Effect of chemical composition on the thermoelectric properties of Pb-Ag-Te compounds. In: Materials Science and Condensed Matter Physics. Editia a 8-a, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, p. 149. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia a 8-a, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Effect of chemical composition on the thermoelectric properties of Pb-Ag-Te compounds


Pag. 149-149

Achimova Elena1, Gorichok I.2, Kryskov Tezarii3, Lyuba T.3, Mazyar D.3, Meshalkin Alexei1, Optasyuk S.3, Rachkovsky O.3, Tkachuk I.3
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Vasilii Stefanyk Precarpathian National University, Ivano-Frankivsk,
3 Ivan Ohienko Kamyanets-Podilsky National University
 
Disponibil în IBN: 29 iulie 2019


Rezumat

Change the chemical composition of compounds based on PbTe, including doping by Ag and Sb allows to obtain materials with thermoelectric figure of merit at (2,2 ... 2,4) [1,2]. However, obtaining the same or similar values of Seebeck coefficient, electrical and thermal conductivity for samples of n- and p-type is not always possible. The influence of the chemical composition and manufacturing conditions of thermoelement's legs on their parameters was analyzed in this work.   Compounds were synthesized by direct fusion method with forced mixing of components. Samples for research were cylindrical shape and were made by cold pressing at pressures (1.5 ... 2) GPa with subsequent low-temperature annealing at temperatures (230 ... 300)°C in air. The research results of influence of changes in the chemical composition on the temperature dependence of the Seebeck coefficient are presented. It was established, that the numerical values of the Seebeck coefficient can be optimized for close range, as shown in Fig.  However, the coefficients of electrical and thermal conductivity vary in the range (4 ... 6)%. This may be due to changes in the concentration of charge carriers and their mobility.