Электронный каталог

Статья

El-Khouly, A.
Hf–Ti Substitution as an Effective Route to Enhance the Thermoelectric Performance of FeNbSb Half-Heusler Alloys / A.El-Khouly, S.M.Amer, T.Lychagina, D.Nikolayev, [a.o.]. – Text : electronic // Journal of Alloys and Compounds. – 2026. – Vol. 1075. – P. 189319. – URL: https://doi.org/10.1016/j.jallcom.2026.189319. – Bibliogr.: 23.

Semiconducting half-Heusler alloys have attracted considerable attention as high temperature thermoelectric materials. In this paper, FeNb&sub(0.9-x)Ti&sub(x)Hf&sub(0.1)Sb (x = 0.00, 0.15, 0.25 and 0.40) samples have been successfully prepared by arc and induction melting. The electrical conductivity and the Seebeck coefficient were measured in the temperature range from 300 to 800 K by the standard four-probe and differential methods respectively. Electrical conductivity showed an enhanced trend over the entire range of temperature measurements. Doping with Ti is an effective dopant for the generation of more charge carriers in FeNb&sub(0.9-x)Ti&sub(x)Hf&sub(0.1)Sb, which is a p-type material. Ti substitution played a crucial role in tuning the carrier concentration and optimizing the balance between electrical conductivity and Seebeck coefficient. The thermoelectric power factor was calculated based on electrical conductivity and the Seebeck coefficient measurements. The highest PF was observed at 33 *mW cm&sup(-1) K⁻&sup(-2) at 800 K for FeNb&sub(0.75)Ti&sub(0.15)Hf&sub(0.1)Sb alloy. The presence of Hf leads to mass fluctuation and lattice distortion, which is beneficial for lowering the lattice thermal conductivity and thus the total thermal conductivity. Low thermal conductivity resulted in an enhanced thermoelectric figure of merit. The maximum figure of merit zT ~ 0.42 was observed for FeNb&sub(0.65)Ti&sub(0.25)Hf&sub(0.1)Sb alloy at T = 800 K. The findings in this research work confirmed that dual Hf–Ti substitution is an effective route to enhance the thermoelectric performance of FeNbSb alloys.



Спец.(статьи,препринты) = С 36 - Физика твердого тела$
ОИЯИ = ОИЯИ (JINR)2026