Tetrahedrite CuSbS with its low thermal conductivity represents a flagship in sulphide thermoelectrics. However, to achieve a reasonable figure-of-merit (measure of thermoelectric efficiency), adequate doping or special sample processing is needed. In this work, a different approach (without doping) is illustrated for the two tetrahedrite-containing systems. binary composite tetrahedrite CuSbS/chalcopyrite CuFeS was prepared by with the aim to obtain partly decomposed tetrahedrite. In this approach, the alkaline leaching medium (NaS + NaOH) was applied to extract Sb from tetrahedrite thus changing its composition. The obtained composite (formed from its own phases in an intrinsic mode) shows low values of = K in comparison with the non-treated tetrahedrite where was K. In this case the extremely high electric resistivity (6–20 mΩ cm) was documented. binary composite tetrahedrite CuSbS/muscovite KAl(AlSiO)(OH) (formed from its own and foreign phases in an extrinsic mode) was prepared by two-step in which combined treatment of industrial vibratory milling and subsequent laboratory planetary milling was applied. The addition of a foreign phase, muscovite, did not give extraordinary thermoelectric performance results. However, the two-step milling process (without the addition of foreign phase) gives the value of = K which belongs to the highest in the tetrahedrite thermoelectric community. In this case, the two-times increase in specific surface area and the increased amount of tetrahedrite in comparison to famatinite are suspectable for this effect. Both applied non-traditional approaches to synthesize tetrahedrite composites form a platform for potential modification of its thermoelectric performance.

中文翻译：

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通过机械化学和复合材料形成的联合处理来改进四面体 Cu12Sb4S13 热电性能

四面体 CuSbS 具有低导热率，是硫化物热电材料的旗舰产品。然而，为了实现合理的品质因数（热电效率的测量），需要充分的掺杂或特殊的样品处理。在这项工作中，针对两种含四面体的系统阐述了一种不同的方法（无掺杂）。为了获得部分分解的四面体，制备了二元复合四面体CuSbS/黄铜矿CuFeS。在该方法中，使用碱性浸出介质（NaS + NaOH）从四面体中提取锑，从而改变其成分。与未经处理的四面体 (K) 相比，所获得的复合材料（以本征模式由其自身相形成）显示出较低的 = K 值。在这种情况下，记录了极高的电阻率 (6–20 mΩ cm)。采用工业振动研磨和随后的实验室行星研磨相结合的两步法制备了二元复合四面体 CuSbS/白云母 KAl(AlSiO)(OH)（以外在方式由自身相和异相形成）。添加外来相白云母并没有产生非凡的热电性能结果。然而，两步铣削工艺（不添加外来相）给出的=K值在四面体热电界属于最高值。在这种情况下，与铁铁矿相比，比表面积增加两倍以及四面体数量增加可能是造成这种效应的原因。两种应用非传统方法合成四面体复合材料的方法形成了潜在修改其热电性能的平台。