Thermoelectric and mechanical properties of Bi0.4Sb1.6Te3 solid solution extruded from granules obtaining by melt crystallization

The microstructure, composition, mechanical and thermoelectric properties of samples cut from different sections of a rod with a diameter of 20 mm, a length of 300 mm, extruded from a briquette pressed from granules obtained by crystallization of Bi0.4Sb1.6Te3 solid solution in water were investigat...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2019-12, Vol.1347 (1)
Main Authors: Ivanova, L D, Granatkina, Yu V, Malchev, A G, Nikhezina, I Yu, Emelyanov, M V, Nikulin, D S, Lavrentev, M G
Format: Article
Language:English
Subjects:
Briquets
Composition
Compression tests
Compressive strength
Crystallization
Diameters
Electrical resistivity
Extrusion
Figure of merit
Granular materials
Mechanical properties
Physics
Room temperature
Seebeck effect
Solid solutions
Tellurium
Temperature
Thermal conductivity
Thermoelectricity
Ultimate tensile strength
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The microstructure, composition, mechanical and thermoelectric properties of samples cut from different sections of a rod with a diameter of 20 mm, a length of 300 mm, extruded from a briquette pressed from granules obtained by crystallization of Bi0.4Sb1.6Te3 solid solution in water were investigated. It was established that the composition of the samples does not change along the length of the rod, while there is a small amount of the second phase (tellurium-based eutectic) is observed both at the beginning and at the end of the rod. A compression test at room temperature showed that the ultimate strength of specimens cut from the end of a rod is ∼10% higher than that of specimens cut from the middle Thermoelectric parameters (electrical conductivity, thermal conductivity, Seebeck coefficient and thermoelectric figure of merit) at room temperature of samples cut from different areas of the rod were σ = 814 ± 55 S/cm, k = 13.2 ± 0.3 W/cm K, α = 234 ± 5 µ V/K, ZT = 0.93-1.12. Measurements of the thermoelectric properties of these samples in the temperature range of 100-600 K showed that the intrinsic conductivity occurs at temperatures above 450 K. The maximum thermoelectric figure of merit ZTmax = 1.2 ± 0.1 was obtained at a temperature of 340 K.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1347/1/012116