Fabrication and thermoelectric property of nanostructured Si/Cr0.8Mn0.2Si2 eutectic alloy by melt-spinning
Abstract
In the present study, we synthesized nanometer-sized composite of Si and (Cr, Mn)Si2 with the eutectic composition. The appropriate Cr/Mn ratio and correct eutectic composition were examined. The n-type nanostructured P-doped Si-Cr0.80Mn0.20Si2 eutectic alloy was successfully fabricated by melt-spinning. The ribbon-like samples were obtained with lamellar spacing range of 20-40 nm. The ribbons were then pulverized and sintered by spark plasma sintering with the size of the morphology change to about 100-200 nm. The thermal conductivity of sintered sample was reduced by 20%-30% at room temperature, which results in increase of the dimensionless figure-of-merit value by 50%. The self-organizing structure refinement process, based on liquid quenching at the eutectic reaction, is considered to be an effective method to enhance the thermoelectric performance.
- Publication:
-
Materials Research Express
- Pub Date:
- February 2019
- DOI:
- 10.1088/2053-1591/aaee98
- Bibcode:
- 2019MRE.....6b5702N
- Keywords:
-
- thermoelectric materials;
- melt spinning;
- eutectic composition;
- nanostructure;
- silicon