Funct. Mater. 2022; 29 (2): 209-214.
Effect of heat treatment on the manifestation of a percolation phase transition in the semiconductor Pb1-xSnxTe solid solutions
National Technical University Kharkiv Polytechnic Institute, 2 Kyrpychova Str., 61002 Kharkiv, Ukraine
Investigation establish the influence of the technology of preparation and aging of the Pb1-xSnxTe solid solutions (0 < x≤0.09) on the manifestation of a percolation-type concentration-dependent phase transition associated with the formation of impurity continuum. The room-temperature dependences of microhardness H, electrical conductivity σ and the Seebeck coefficient S on the alloy composition after different types of heat treatment as well as after long-term aging of the alloys. In all cases, concentration-dependent anomalies in the region x = 0.015-0.03 were observed, indicating the presence of a percolation transition, but the nature of the anomalies was different. The obtained H(x), σ(x) and S(x) dependences are interpreted taking into consideration the influence of time and temperature factors on the diffusion processes occurring in the system, the concentration of intrinsic and impurity defects, and the percolation threshold.
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