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Effect of Composition Regulation on Thermoelectric Properties of Fe3Al2Si3-Based Compounds.
- Source :
- Journal of Electronic Materials; Jan2024, Vol. 53 Issue 1, p171-176, 6p
- Publication Year :
- 2024
-
Abstract
- Fe<subscript>3</subscript>Al<subscript>2</subscript>Si<subscript>3</subscript>-based thermoelectric materials have low production costs and are environmentally friendly. However, they are usually synthesized via arc-melting, resulting in poor compositional accuracy. Here, Fe<subscript>36.5</subscript>Al<subscript>23.5 + x</subscript>Si<subscript>40−x</subscript> (x = 1.7, 1.8, 1.9, 2.0, and 2.1) compounds with low thermal conductivity (κ) were prepared via levitation melting. The x = 2.1 composition may be the threshold for a p-to-n-type transformation. A minimum κ of ~3.17 W/mK was obtained in Fe<subscript>36.5</subscript>Al<subscript>25.4</subscript>Si<subscript>38.1</subscript> at 323 K, a decrease of 42.3% relative to the parent Fe<subscript>3</subscript>Al<subscript>2</subscript>Si<subscript>3</subscript> compound. Moreover, the largest maximum power factor of ~461 μW m<superscript>−1</superscript> K<superscript>−2</superscript> was obtained in Fe<subscript>36.5</subscript>Al<subscript>25.4</subscript>Si<subscript>38.1</subscript> at 373 K. Using composition self-tuning, a peak figure of merit of ~0.055 was obtained in Fe<subscript>36.5</subscript>Al<subscript>25.4</subscript>Si<subscript>38.1</subscript> at 423 K. This approach for realizing low κ and a high compositional accuracy should impact the development of advanced room-temperature thermoelectric materials with narrow bandgaps. [ABSTRACT FROM AUTHOR]
- Subjects :
- THERMOELECTRIC materials
THERMAL conductivity
INDUSTRIAL costs
LEVITATION
MELTING
Subjects
Details
- Language :
- English
- ISSN :
- 03615235
- Volume :
- 53
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Electronic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 174014756
- Full Text :
- https://doi.org/10.1007/s11664-023-10746-7