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Regulating thermoelectric properties of Eu0.5Ca0.5Zn2Sb2through Mg dopant
- Source :
- Materials Today Energy; August 2022, Vol. 28 Issue: 1
- Publication Year :
- 2022
-
Abstract
- CaAl2Si2structure Zintl compounds are promising thermoelectric materials and have been extensively studied recently. In this study, Eu0.5Ca0.5Zn2-xMgxSb2(0 ≤ x ≤ 0.3) compounds have been prepared by ball milling and spark plasma sintering. Results show that for Eu0.5Ca0.5Zn2Sb2, ZThas been improved about 20% compared with previously reported thermoelectric properties through the ball milling and hot-pressing preparation process. Moreover, the thermoelectric performance of Eu0.5Ca0.5Zn2Sb2can be further increased through Mg substitution. Mg replacing Zn has a strong impact on phonon scattering, resulting in low thermal conductivity. A highest ZTabout 1.05 is obtained in the Eu0.5Ca0.5Zn1.8Mg0.2Sb2sample at 773 K. The obtained high thermoelectric performance in our work is comparable with other p-type Zintl thermoelectric materials, and this work provides a reference for the improvement of properties of other CaAl2Si2structure Zintl thermoelectric materials.
Details
- Language :
- English
- ISSN :
- 24686069
- Volume :
- 28
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Materials Today Energy
- Publication Type :
- Periodical
- Accession number :
- ejs59917804
- Full Text :
- https://doi.org/10.1016/j.mtener.2022.101071