Effect of rod-like CrSb morphology on electrical and thermal transport in InSb–CrSb eutectic composites

InSb–CrSb eutectic composites were synthesized by Bridgman directional solidification, producing a well-aligned microstructure of CrSb rods embedded in an InSb matrix. The oriented eutectic architecture exhibits pronounced anisotropic thermoelectric transport, with higher electrical conductivity along the growth direction (σ∥/σ⊥ ≈ 3.75) and weaker thermal conductivity anisotropy (κ∥/κ⊥ ≈ 1.37) due to phonon scattering at InSb–CrSb interfaces. These results demonstrate that directional eutectic solidification effectively tailors microstructure-controlled anisotropic electrical and thermal transport in InSb-based thermoelectric composites. The aligned rod-like morphology promotes continuous carrier pathways while suppressing lattice heat transport through interface-induced phonon scattering, highlighting the potential.