Affiliation:
1. National Research University of Electronic Technology
Abstract
Nanostructuring of thermoelectric materials (TEM) obtained by compacting nanodisperse powders is an effective way to increase their figure of merit by reducing phonon thermal conductivity. The optimal sizes of the structural elements of nanostructured TEM in the range of 10–100 nm, effectively scattering phonons with an average free path, which determine the maximum contribution to the heat transfer processes, have been established. Methods and modes of synthesis are presented, TEM based on: Bi2Te3; Sb2Te3; PbTe; GeTe and SiGe are obtained. A technology for producing nanodisperse TEM powders using a planetary ball mill has been developed. Optimal conditions for grinding TEM have been determined: the diameter of the grinding balls is 5 mm; the ratio of the mass of the balls and TEM is 10:1; the rotation speed of the planetary disk of the ball mill is 400 rpm; grinding time 50 min. Nanodisperse powders of the specified TEM are obtained. The phase composition, fine structure, and value of microdeformations of the obtained TEM nanodisperse powders were studied using transmission electron microscopy. It is established that at different times of powder grinding, the lattice parameters and, accordingly, the composition of TEM do not change. The values of microdeformations caused by mechanical action on the TEM change slightly with increasing powder grinding time. For all studied TEMs, except PbTe, the minimum dimensions of coherent scattering regions in powders are obtained at the level of 14–29 nm. For PbTe, these dimensions are much larger and amounted to 84–87 nm.
Publisher
National University of Science and Technology MISiS
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