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Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion
In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body appr...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621126/ https://www.ncbi.nlm.nih.gov/pubmed/34832459 http://dx.doi.org/10.3390/ma14227059 |
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author | Lavrentev, Mikhail G. Bublik, Vladimir T. Milovich, Filipp O. Panchenko, Viktoriya P. Parkhomenko, Yuri N. Prostomolotov, Anatoly I. Tabachkova, Nataliya Yu. Verezub, Nataliya A. Voronov, Mikhail V. Yarkov, Ivan Yu. |
author_facet | Lavrentev, Mikhail G. Bublik, Vladimir T. Milovich, Filipp O. Panchenko, Viktoriya P. Parkhomenko, Yuri N. Prostomolotov, Anatoly I. Tabachkova, Nataliya Yu. Verezub, Nataliya A. Voronov, Mikhail V. Yarkov, Ivan Yu. |
author_sort | Lavrentev, Mikhail G. |
collection | PubMed |
description | In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)(2)Te(3) solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)(2)Te(3) thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10(−3) K(−1)). |
format | Online Article Text |
id | pubmed-8621126 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-86211262021-11-27 Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion Lavrentev, Mikhail G. Bublik, Vladimir T. Milovich, Filipp O. Panchenko, Viktoriya P. Parkhomenko, Yuri N. Prostomolotov, Anatoly I. Tabachkova, Nataliya Yu. Verezub, Nataliya A. Voronov, Mikhail V. Yarkov, Ivan Yu. Materials (Basel) Article In this study, Ingots of (Bi, Sb)(2)Te(3) thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)(2)Te(3) solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)(2)Te(3) thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10(−3) K(−1)). MDPI 2021-11-21 /pmc/articles/PMC8621126/ /pubmed/34832459 http://dx.doi.org/10.3390/ma14227059 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Lavrentev, Mikhail G. Bublik, Vladimir T. Milovich, Filipp O. Panchenko, Viktoriya P. Parkhomenko, Yuri N. Prostomolotov, Anatoly I. Tabachkova, Nataliya Yu. Verezub, Nataliya A. Voronov, Mikhail V. Yarkov, Ivan Yu. Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title | Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title_full | Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title_fullStr | Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title_full_unstemmed | Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title_short | Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion |
title_sort | regularities of structure formation in 30 mm rods of thermoelectric material during hot extrusion |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621126/ https://www.ncbi.nlm.nih.gov/pubmed/34832459 http://dx.doi.org/10.3390/ma14227059 |
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