Enhanced thermoelectric performance of p-type BiSbTe through incorporation of magnetic CrSb

Fortulan, Raphael; Li, Suwei; Reece, Michael John; Serhiienko, Illia; Mori, Takao; Aminorroaya Yamini, Sima

Abstract

There is evidence that magnetism can potentially increase the thermopower of materials , most likely due to magnon scattering, suggesting the incorporation of intrinsic magnetic semiconductors in non-magnetic thermoelectric materials. Here, samples of p-type Bi 0.5 Sb 1.5 Te 3 with 10 at.% excess Te are ball-milled with varying ratios of the antiferro-magnetic semiconductor CrSb (0, 0.125, 0.5, and 1 wt.%) to prepare bulk samples by spark plasma sintering technique. The thermopower of samples containing CrSb is increased due to an increase in the effective mass of the charge carriers, indicating that there is a drag effect originating from the magnetic particles. However, this was at the expense of reduced electrical conductivity caused by reduced charge carrier mobility. While overall only marginal improvements in power factors were observed, these samples exhibited significantly lower thermal conductivity compared to the single-phase material. As a result, a peak zT value of ∼1.4 was achieved at 325 K for the sample with 0.125 wt.% CrSb. These results highlight the potential of incorporating magnetic secondary phases to enhance the

• Journal Article Type: Article
• Acceptance Date: Nov 1, 2024
• Online Publication Date: Nov 11, 2024
• Publication Date: Nov 11, 2024
• Deposit Date: Nov 12, 2024
• Publicly Available Date: Nov 20, 2024
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: AIP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 125
• Issue: 20
• Article Number: 203903
• DOI: https://doi.org/10.1063/5.0235499
• Public URL: https://uwe-repository.worktribe.com/output/13419608