Baláž Peter, Dutková Erika, Baláž Matej, Džunda Róbert, Navrátil Jiří, Knížek Karel, Levinský Petr, Hejtmánek Jiří
Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001, Košice, Slovakia.
Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001, Košice, Slovakia.
ChemistryOpen. 2021 Aug;10(8):806-814. doi: 10.1002/open.202100144.
Chalcopyrite CuFeS , a semiconductor with applications in chemical sector and energy conversion engineering, was synthetized in a planetary mill from elemental precursors. The synthesis is environmentally friendly, waste-free and inexpensive. The synthesized nano-powders were characterized by XRD, SEM, EDX, BET and UV/Vis techniques, tests of chemical reactivity and, namely, thermoelectric performance of sintered ceramics followed. The crystallite size of ∼13 nm and the strain of ∼17 were calculated for CuFeS powders milled for 60, 120, 180 and 240 min, respectively. The evolution of characteristic band gaps, Eg, and the rate constant of leaching, k, of nano-powders are corroborated by the universal evolution of the parameter S /X (S -specific surface area, X-crystallinity) introduced for complex characterization of mechanochemically activated solids in various fields such as chemical engineering and/or energy conversion. The focus on non-doped semiconducting CuFeS enabled to assess the role of impurities, which critically and often negatively influence the thermoelectric properties.
黄铜矿（CuFeS₂）是一种半导体，应用于化学领域和能量转换工程，它由元素前驱体在行星式球磨机中合成。该合成方法环保、无废料且成本低廉。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDX）、比表面积分析仪（BET）和紫外可见光谱（UV/Vis）技术对合成的纳米粉末进行了表征，随后对烧结陶瓷的化学反应性，特别是热电性能进行了测试。分别计算了球磨60、120、180和240分钟的CuFeS₂粉末的微晶尺寸约为13 nm，应变约为17。纳米粉末的特征带隙Eg和浸出速率常数k的演变，通过为化学工程和/或能量转换等各个领域中机械化学活化固体的复杂表征引入的参数S/X（S-比表面积，X-结晶度）的普遍演变得到了证实。对非掺杂半导体CuFeS₂的关注使得能够评估杂质的作用，杂质通常会对热电性能产生严重且往往负面的影响。
