Back to Search
Start Over
Thermoelectric properties and low thermal conductivity of nanocomposite ZrTe5 under magnetic field.
- Source :
-
Journal of Alloys & Compounds . Nov2020, Vol. 840, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Zirconium pentatelluride (ZrTe 5) single crystal has recently received significant attention because of its quantum electronic transport properties and is regarded as a promising candidate for low-temperature thermoelectric cooling and spintronic applications. However, single crystal of ZrTe 5 has generally small sizes and can only be produced in small quantities using a complicated process, whereas ZrTe 5 polycrystals are easily produced and their properties are easily adjusted. In this study, we focus on the magneto-transport properties at low temperatures of nanocomposites of ZrTe 5 produced using both hand-milling and ball-milling processes to investigate the impact of the microstructure. The ball-milled sample shows a low thermal conductivity of 1 W m−1 K−1, which is almost a constant below 300 K. However, due to its small grain sizes, the electron mobility is significantly decreased, thus their thermoelectric performances are not as good as that of the hand-milled sample. Also, below 25 K, the resistivity and the Seebeck coefficient of the ball-milled sample are decreased, which is associated with the energy barrier at their grain boundaries. Due to the larger grain sizes and fewer defects in the hand-milled sample, the external magnetic field shows a significant influence on its thermoelectric properties at low temperatures. These results indicate that polycrystalline ZrTe 5 with large grain sizes may exhibit similar quantum properties as those of single crystals. Image 1 • ZrTe 5 nanocomposites were synthesized by hand-milling and ball-milling. • Relation between the microstructure and thermoelectric properties is established. • Ball-milled sample has a very low thermal conductivity of 1 W m−1 K−1. • Magnetoresistance ratio is larger when grain size is bigger. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 840
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 143765981
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.155651