One step synthesis and sintering of Ni and Zn substituted tetrahedrite as thermoelectric material
One step synthesis and sintering of Ni and Zn substituted tetrahedrite as thermoelectric material
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DOI：
10.1016/j.jallcom.2017.01.187
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发表时间：
2017-04-25
影响因子：
6.2
通讯作者：
Fabrizio, M.
中科院分区：
文献类型：
--
作者：
Battiston, S.;Fanciulli, C.;Fabrizio, M.
黝铜矿矿物家族是地壳上最广泛的硫盐之一，似乎符合有吸引力的可持续p型热电材料的正确特征，显示出相对较高的转换效率。采用球磨法制备硫化物粉末，然后采用开式模压（ODP）一步合成烧结工艺制备了硫化物粉末。这种简单，快速，易于扩展的路线在这项工作中第一次被广泛讨论，并允许从硫化物前体开始获得热电颗粒，整个过程持续不到6小时。Zn和Ni阳离子作为Cu的部分取代基加入到Cu_（12）Sb_（4S）_（13）中，可以显著提高ODP法制备的未掺杂材料的热电性能。通过X射线衍射、扫描电镜和能谱分析研究了前驱体配比对合成的黝铜矿相、第二相含量和化学计量比的影响。样品的密度和机械稳定性作为化学组成和加工参数的函数进行评价。对具有不同锌和镍取代度的样品进行了完整的热电表征，温度高达400摄氏度。(C)2017 Elsevier B.V.版权所有。
Tetrahedrite mineral family, one of the most widespread sulfosalts on Earth's crust, seems to meet the right features for an attractive sustainable p-type thermoelectric material, showing relatively high conversion efficiency. The sulphide powders were ball milled and then one-step simultaneous synthesis and sintering process was performed by open die pressing (ODP). This simple, fast, and easy scalable route was extensively discussed for the first time in this work and permitted to obtain thermoelectric pellets starting from sulphide precursors, with a whole process lasting less than 6 h. Both Zn and Ni cations were added as partial substituents of Cu in Cu12Sb4S13 permitting to considerably improve the thermoelectric performances of the undoped material prepared by ODP. The influence of precursors ratio on the tetrahedrite phase, secondary phase content and stoichiometry were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The density and mechanical stability of samples were evaluated as a function of the chemical composition and processing parameters. A complete thermoelectric characterization was carried out for samples with different Zn and Ni substitution up to 400 degrees C. (C) 2017 Elsevier B.V. All rights reserved.