Concentration anomalies of galvanomagnetic properties of (Bi1-хSbх)2Te3 solid solutions based on Sb2Te3 in the (Bi1-хSbх)2Te3 system

doi:10.26565/2222-5617-2023-38-05

K.V. Martynova Національний Технічний Університет "Харківський політехнічний інститут" https://orcid.org/0000-0001-9739-4584
O.I. Rohachova National Technical University «Kharkiv Polytechnic Institute» https://orcid.org/0000-0001-7584-656X

DOI: https://doi.org/10.26565/2222-5617-2023-38-05

Keywords: (Bi1-хSbх)2Te3 solid solutions, composition, electrical conductivity, Hall coefficient, Hall mobility, percolation

Abstract

Today, solid solutions based on antimony and bismuth tellurides are among the most widely used materials for the p-legs of thermoelectric converters used at room temperature and below. This paper presents the results of a study of galvanomagnetic properties (electrical conductivity σ, Hall coefficient R_H, Hall mobility of charge carriers μ_H) of thermoelectric solid solutions (Bi_1-хSb_х)₂Te₃ in the range of compositions close to pure antimony telluride (x = 1 – 0.96) at temperatures T = 80 K and T = 300 K.

The study was carried out on cast polycrystalline samples obtained by the method of crystallization from the melt followed by long-term annealing in vacuum at a temperature of T = 650 K. Galvanomagnetic properties were measured by the standard dc-method, the experimental cell was cooled with liquid nitrogen. The measurement error of R_H and σ did not exceed ± 5%.

It is shown that the introduction of the first portions of Bi₂Te₃leads to a sharp decrease in σ, which is associated with a high degree of disorder of the crystal lattice. In the range of compositions x = 0.99 – 0.9825, the concentration dependences of σ(x) and μ_H(x) revealed anomalous growth of σ and μ_H. The presence of concentration anomalies is associated with the transition from dilute to concentrated solid solutions. An assumption is made about the percolation nature of the phase transition. Within the framework of the problem of spheres of percolation theory, within the framework of the task of spheres of the theory of percolation the radius of the deformation sphere of an impurity atom (Bi) is estimated. The obtained value is consistent with the short-range potential of the impurity. It is shown that the position of the anomalies in the σ(x) and μ_H(x) dependences does not change with the decrease in temperature down to 80K.

Thus, the observation of concentration anomalies of the properties for the solid solution (Bi_1-xSb_x)₂Te₃ is another confirmation of the hypothesis about the universal nature of the behavior of solid solutions at a low impurity concentration. The detected anomalies must be taken into account when developing methods for increasing the thermoelectric performance of materials by creating solid solutions and doping.

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