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首页> 外文期刊>Journal of Materials Research >Nanostructured Nb-substituted CaMnO_3 n-type thermoelectric material prepared in a continuous process by ultrasonic spray combustion
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Nanostructured Nb-substituted CaMnO_3 n-type thermoelectric material prepared in a continuous process by ultrasonic spray combustion

机译：超声喷雾燃烧连续法制备的纳米结构Nb取代CaMnO_3 n型热电材料

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摘要

One way to further optimize the thermoelectric properties toward a higher ZT is a temperature stable nanoengineering of materials, where the thermal conductivity is reduced by increasing the phonon scattering at the grain boundaries. To study this, Nb-substituted CaMnO_3 perovskite-type material was synthesized by ultrasonic spray combustion (USC). The grain growth has been characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Finally, the thermoelectric properties of compacted and sintered bulk samples from powder prepared by a continuous scalable USC process were measured up to 1050 K. The thermoelectric legs were prepared by an adapted sintering process. Here, a compromise between enhanced porosity to reduce the thermal conductivity and securing of mechanical stability and low resistivity should be obtained. Based on the grain growth mechanisms, an advanced sintering process for additional interconnection of the particles without particle growth is needed to further increase the thermoelectric performance.
机译：朝着更高的ZT进一步优化热电性能的一种方法是材料的温度稳定的纳米工程，其中通过增加晶界处的声子散射来降低热导率。为了对此进行研究，通过超声喷雾燃烧（USC）合成了Nb-取代的CaMnO_3钙钛矿型材料。晶粒生长已通过X射线衍射，扫描电子显微镜和透射电子显微镜表征。最终，测量了通过连续可扩展USC工艺制备的粉末的压实和烧结块状样品的热电性能，最高测量到1050K。热电腿通过合适的烧结工艺制备。在此，应当在增加的孔隙率以降低导热性与确保机械稳定性和低电阻率之间取得折衷。基于晶粒长大的机理，需要一种先进的烧结工艺，以在不增加颗粒长大的情况下进行颗粒的额外互连，以进一步提高热电性能。

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  • 来源
    《Journal of Materials Research》 |2011年第15期|p.1940-1946|共7页
  • 作者

    Sascha Populoh; Matthias Trottmann; Myriam H. Aguire; Anke Weidenkaff;

  • 作者单位

    Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland;

    Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland;

    Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland;

    Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Duebendorf, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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