K. Park, M.F.M. Sabri, H.Y. Hong, S.Y. Gwon, P. Puspitasari, S.-J. Kim
The influence of SiC nanoparticles on hole transport and thermoelectric properties in Bi1.9Mg0.1Sr2Co2Oy/SiC composites was systematically investigated. Incorporating a small amount of SiC nanoparticles (0.02 wt%) simultaneously enhanced electrical conductivity and the Seebeck coefficient through increases in hole concentration and interface-related carrier-filtering effects, respectively. Thermal conductivity was governed by two competing effects: enhanced phonon scattering at the matrix/SiC interfaces and the high intrinsic thermal conductivity of SiC. The composite containing 0.02 wt% SiC exhibited the highest dimensionless figure-of-merit (ZT) of 0.172 at 973 K. Pearson correlation analysis quantitatively revealed the relationships among SiC content, hole transport, and thermoelectric parameters. By integrating thermoelectric measurements with Pearson correlation analysis, the dominant transport mechanisms governing thermoelectric performance were systematically clarified. These integrated investigations provide a quantitative analytical framework for optimizing thermoelectric properties in Bi1.9Mg0.1Sr2Co2Oy/SiC composites. © 2026 The Author(s)
Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, 05006, South Korea; Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Nanomaterials Engineering Research Center, Universitas Negeri Malang, Malang, 65145, Indonesia; Metal-organic Compounds Materials Research Center, Sejong University, Seoul, 05006, South Korea
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