Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 872, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159630
Keywords
PbTe; Ge doping; Seebeck coefficient; Electrical conductivity; Power factor
Categories
Funding
- Academy of Scientific Research and Technology, Egypt [2-2020-2021]
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Stoichiometric Pb1-xGexTe crystalline alloys were synthesized and their crystal structure and thermoelectric properties were investigated. Highly Ge-doped samples exhibited the highest thermoelectric power factor at high temperatures. A noticeable reduction in electronic thermal conductivity due to Ge doping was observed, which could lead to a considerable enhancement in the thermoelectric figure of merit.
In this work, stoichiometric Pb1-xGexTe (x = 0.0, 0.03, 0.06, 0.09, 0.12) crystalline alloys were synthesized using the monotonical temperature melting technique. The synthesized alloys were examined using x-ray diffraction and scanning electron microscope. It was revealed that the crystal structure in all samples is a cubic phase of PbTe. In terms of Seebeck coefficient and electrical conductivity, thermoelectric measurements were carried out in the temperature range of 83-373 K. The Seebeck coefficient of the compounds showed a positive sign, which refers to p-type conduction. The thermoelectric power factor (PF) was studied as a function of temperature, with different amounts of Ge content (x). The highest PF was recorded for the highly Ge-doped samples at higher temperatures (373 K). The maximum PF was observed at 3.2 x 10(2) mu W/m K-2 for the sample with x = 0.09, which is quite high for the studied compounds. The electronic part of thermal conductivity was calculated using the Wiedemann-Franz law. A noticeable reduction of this thermal conductivity was detected due to stronger point defect scattering introduced by Ge doping. The reduction in the electronic thermal conductivity can led to a considerable enhancement in the thermoelectric figure of merit. (C) 2021 Elsevier B.V. All rights reserved.
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