Cu3SbSe3-based composites have been prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) technology. Phase composition and microstructure analysis indicate that the obtained samples are mainly composed of Cu3SbSe3 phase and CuSbSe2/Cu2-xSe secondary phases. Our results show that the existence of Cu2-xSe phase can clearly enhance the electrical conductivity of the composites (similar to 16 S/cm), which is 2.5 times higher than the pure phase. The thermal conductivity can remain at about 0.30 W.m(-1).K-1 at 653 K. A maximum ZT (defined as ZT =3D S-2 sigma T/kappa, where S, sigma, T, kappa are the Seebeck coefficient, electrical conductivity, absolute temperature and total thermal conductivity) of the sample SPS 633 can be 0.42 at 653 K, which is 60% higher than the previously reported values. Our results indicate that the composite structure is an effective method to enhance the performance of Cu3SbSe3.
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