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Bui D. Long,Le T. Bang Techno-Press 2024 Advances in materials research Vol.13 No.1
Cu-based sulfides have recently emerged as promising thermoelectric (TE) materials due to their low cost, non-toxicity, and abundance. In this research, point defect structure of Cu<sub>2-x</sub>ZnSnS<sub>4</sub> (x=0.1, 0.2, 0.3) samples were synthesized by the mechanical alloying method. Mixed powders of Cu, Zn, Sn and S were milled using high energy ball milling at a rotation speed of 300 rpm in Ar atmosphere. The milled Cu<sub>2-x</sub>ZnSnS<sub>4</sub> powders were heat-treated at 723 K for 24 h, and subsequently consolidated using spark plasma sintering (SPS) under an applied pressure of 60 MPa for 15 min. The thermal conductivity of the sintered Cu<sub>2-x</sub>ZnSnS<sub>4</sub> samples was evaluated. A well-defined Cu<sub>2-x</sub>ZnSnS<sub>4</sub> powders were successfully formed after milling for 16 h, with the particle sizes mostly distributed in the range of 60-100 nm. The lattice constants of aand cdecreased with increasing composition value x. The thermal conductivity of sintered x=0.1 sample exhibited the lowest value and attained 0.93 W/m K at 673 K.