Abstract
The β-FeSi 2 (n-type Fe 0.98Co 0.02Si 2) sintered bodies with dispersion of Y 2O 3 particles were synthesized by mechanical alloying of Fe–Si powder with Y 2O 3 powder and subsequent hot pressing. The effects of Y 2O 3 addition on the thermoelectric properties of the β-FeSi 2 were investigated. The thermal conductivity of the β-FeSi 2 was significantly reduced by dispersion of fine Y 2O 3 particles on the β phase matrix. On the other hand, the electrical resistivity increased with increasing amount of Y 2O 3. The Seebeck coefficient was enhanced by Y 2O 3 addition, especially below 800 K, corresponding to the extrinsic conductive region of the β-FeSi 2. Consequently, the figure of merit was significantly improved by 2 mass% Y 2O 3 addition. The energy dispersive X-ray spectroscopy (EDX) analysis revealed that the added Y 2O 3 was partially decomposed and a small amount of Y was dissolved in the β phase matrix. Based on this fact, the enhancement of the Seebeck coefficient caused by Y 2O 3 addition is considered to be due to reduction in carrier concentration which resulted from this Y solution as a p-type dopant in the β phase matrix, and the behavior of the Seebeck coefficient was found to be well consistent with that of the Y-doped samples synthesized by Y powder addition.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
