Inorganic Materials: Applied Research

, Volume 7, Issue 2, pp 177–186 | Cite as

Thermoelectric figure of merit and magnetic field production abilities of “natural” PbBi2(Te1 − x Se x )4 + δ and PbBi4(Te1 − x Se x )7 + δ nanostructures

  • E. S. Avilov
  • M. A. Korzhuev
  • M. A. Kretova
  • A. B. Michajlova
Materials of Electronic
  • 27 Downloads

Abstract

Layered crystals PbBi2(Te1 − x Se x )4 + δ and PbBi4(Te1 − x Se x )7 + δ with the stoichiometry deviation toward the excess of chalcogenides (x = 0–0.7; δ = 0–0.1) are synthesized. The obtained compounds are attributed to “natural” Bi2Te3-type nanostructures with changed nanoidentity parameters (ξ1 is the layer package thickness, and ξ2 = c is the increased lattice period along the trigonal crystal axis). A change in the parameters ξ1 and ξ2 amplifies the phonon scattering in the samples, causing low thermal conductivity of the crystal lattice of alloys, which is κph = (4.3–7.2) × 10−3 W/(cm K) close to the thermal conductivity of amorphous materials. The presence of finely divided precipitations of the additional phases (δ > 0) favors a decrease in the value of κph. In this case, the lower mobility of electrons μ favors a decrease in the maximum figure of merit values (Z = α2σ/κ) for the samples in comparison with PbTe and Bi2Te3 alloys. At the same time, the low values of κph and Z lead to an increase in the magnetic field production ability of alloys, which attain high values of X = Y/(1 + ZT) > 4–5 (here, Y = ασ/κ). No features of the belonging of the studied materials to a class of 3D “topological insulators” (dielectrics in the bulk and metals on the surface) are found over the temperature range of 77–700 K.

Keywords

thermoelectric materials layered crystals “natural” nanostructures thermoelectric figure of merit magnetic field production ability topological insulator 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • E. S. Avilov
    • 1
  • M. A. Korzhuev
    • 1
  • M. A. Kretova
    • 1
  • A. B. Michajlova
    • 1
  1. 1.Institute of Metallurgy and Materials ScienceRussian Academy of SciencesMoscowRussia

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