Version 1
: Received: 11 January 2024 / Approved: 11 January 2024 / Online: 12 January 2024 (09:55:53 CET)
How to cite:
Samourgkanidis, G.; Kyratsi, T. Influence of Laser Treatment on the Thermoelectric Properties of Bismuth Antimony Telluride Material. Preprints2024, 2024010966. https://doi.org/10.20944/preprints202401.0966.v1
Samourgkanidis, G.; Kyratsi, T. Influence of Laser Treatment on the Thermoelectric Properties of Bismuth Antimony Telluride Material. Preprints 2024, 2024010966. https://doi.org/10.20944/preprints202401.0966.v1
Samourgkanidis, G.; Kyratsi, T. Influence of Laser Treatment on the Thermoelectric Properties of Bismuth Antimony Telluride Material. Preprints2024, 2024010966. https://doi.org/10.20944/preprints202401.0966.v1
APA Style
Samourgkanidis, G., & Kyratsi, T. (2024). Influence of Laser Treatment on the Thermoelectric Properties of Bismuth Antimony Telluride Material. Preprints. https://doi.org/10.20944/preprints202401.0966.v1
Chicago/Turabian Style
Samourgkanidis, G. and Theodora Kyratsi. 2024 "Influence of Laser Treatment on the Thermoelectric Properties of Bismuth Antimony Telluride Material" Preprints. https://doi.org/10.20944/preprints202401.0966.v1
Abstract
In this study, the effect of laser processing (LP) on the thermoelectric (TE) properties of bismuth antimony telluride (BST) alloy pellets is investigated. The stoichiometric alloy used is Bi0.4Sb1.6Te3.0, which was prepared by mechanical alloying techniques (MA) and hot pressed (HP) into pellets under optimal pressing and temperature conditions. An innovative approach to HP was also developed to enhance the yield of BST samples per HP process while maintaining the TE profiles of the samples within a variance of less than 1%. The LP process was executed by employing a metal 3D printer, with a thorough analysis of beam parameters. Notably, the laser power (P) was held constant at 25 W, along with a fixed hatching distance (HD) of 50 μm, while the parameter adjusted was the laser's scanning speed (SS), which spanned from [600 - 1800] mm/s in increments of 200 mm/s. Examination via scanning electron microscopy (SEM) revealed two material states: melted and sintered. The melted state formed the surface crust of "canyon" patterns that were held on the surface of the samples, and which both size and quantity were altered with changes in SS. For thermoelectric characterization, two distinct shapes of LP samples were produced: rectangular (for electrical properties) and disk (for thermal properties). The results demonstrated that the electrical properties are profoundly influenced by SS, with the electrical conductivity peak at SS value of 1600 mm/s, while the Seebeck coefficient reaches a minimum at the same value. Consequently, within the temperature range of interest, a notable 12% increase in electrical conductivity and a 9% decrease in the Seebeck coefficient were observed compared to the non-LP material state. Overall, the ZT value experience an 6.9% decline within the same temperature interval.
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
