Cu_2-xS compounds with low-cost and low-toxicity elements have been reported as good candidates for thermoelectric (TE) application. In this work, the Cu_1.96S powders were synthesized by both hydrothermal synthesis (HS) and mechanical alloying (MA) methods. The HS synthesis process and mechanism was discussed in detail. The polycrystalline Cu_1.96S bulk materials were obtained by condensing the powders (prepared by HS and MA) or the mixed HS and MA powers with the different ratio (1:0, 9:1, 1:9 and 0:1) using spark plasma sintering (SPS) technique. The phase structure, microstructure of the powders and bulk samples were checked. The results show that the Cu_1.96S powders synthesized by HS are more stable than the powder prepared by MA method during the SPS process. And the thermoelectric properties of all bulk samples were investigated in detail at the temperature ranges from 323 to 773 K. The Cu_1.96S bulk sample sintered by using mixed powders of 90 wt% HSed powders and 10 wt% MAed powders obtained the maximum ZT value of 1.01 at 773 K, which is currently the highest reported value for the Cu_1.96S system at this temperature.

据报道，具有低成本和低毒性元素的Cu _{2- x} S化合物是热电（TE）应用的良好候选者。在这项工作中，通过水热合成（HS）和机械合金化（MA）方法合成了_1.96 S铜粉。详细讨论了HS的合成过程和机理。通过使用火花将粉末（由HS和MA制备）或具有不同比例（1：0、9：1、1：9和0：1）的混合HS和MA粉末进行冷凝，可获得多晶Cu _1.96 S块状材料。等离子烧结（SPS）技术。检查粉末和散装样品的相结构，显微结构。结果表明，Cu _1.96通过HS合成的S粉末在SPS过程中比通过MA方法制备的粉末更稳定。并且在323至773 K的温度范围内详细研究了所有块状样品的热电性能。通过使用90 wt％HSed粉末和10 wt％MAed粉末的混合粉末烧结的Cu _1.96 S块状样品获得了最大ZT值在773 K时为1.01，这是目前在该温度下Cu _1.96 S系统的最高报告值。