Abstract Copper(I) sulphide is one of the most intensely studied superionic thermoelectric materials. High mobility of copper ions have positive impact on thermoelectric figure of merit, however it brings some stability drawbacks. In this work we compare thermoelectric properties of Cu2S synthesized under various conditions. All of the obtained powders were densified by induction hot pressing (IHP) at the same conditions. Phase composition, microstructure and thermoelectric homogeneity were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning thermoelectric microprobe (STM), respectively. The influence of synthesis conditions on transport properties, i.e. electrical conductivity, thermal conductivity and Seebeck coefficient were examined in the temperature range 300–923 K. Based on those results, ZT parameter was calculated and the optimal method of the Cu2S synthesis chosen. The highest obtained ZTmax parameter equal to 0.68 at 923 K is 20–40% higher than in other works, where Cu2S was densified by SPS method.

中文翻译：

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高温合成并IHP法烧结得到的Cu2S的热电性能

摘要 硫化铜（I）是研究最深入的超离子热电材料之一。铜离子的高迁移率对热电品质因数有积极影响，但它带来了一些稳定性缺点。在这项工作中，我们比较了在各种条件下合成的 Cu2S 的热电性能。所有获得的粉末都在相同条件下通过感应热压 (IHP) 致密。分别通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和扫描热电探针 (STM) 研究相组成、微观结构和热电均匀性。在 300-923 K 的温度范围内检查了合成条件对传输特性的影响，即电导率、热导率和塞贝克系数。基于这些结果，计算ZT参数并选择Cu2S合成的最佳方法。在 923 K 下获得的最高 ZTmax 参数等于 0.68，比其他工作高 20-40%，其中 Cu2S 是通过 SPS 方法致密的。