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首页> 外文期刊>Energy Conversion & Management >Enhanced thermoelectric performance of heavy-metals (M: Ba, Pb) doped misfit-layered ceramics: (Ca_(2-x)M_xCoO_3)_(0.62)(CoO_2)
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Enhanced thermoelectric performance of heavy-metals (M: Ba, Pb) doped misfit-layered ceramics: (Ca_(2-x)M_xCoO_3)_(0.62)(CoO_2)

机译：重金属（M：Ba，Pb）掺杂错配层陶瓷的增强的热电性能：（Ca_（2-x）M_xCoO_3）_（0.62）（CoO_2）

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摘要

We present the temperature dependent thermoelectric properties of polycrystalline misfit-layered ceramics; (Ca_(2-x)M_xCoO_3)_(0.62) (CoO_2), (M: Ba and Pb, x = 0, 0.1, 0.2), fabricated by sol-gel method followed by spark plasma sintering technique. The X-ray diffraction results confirmed the substitution of Ba and Pb in the lattice of (Ca_2CoO_3)_(0.62) (CoO_2) at Ca-site. An improved grain-alignment was observed at small scale with Ba-doping, which helped increasing the electrical conductivity but for the Pb-doped specimens, the electrical conductivity was suppressed by catastrophic grain-alignment. The bivalent metallic-doping induced a spin-entropy enhancement which resulted in an enhanced thermopower. For Ba-doped specimens, the simultaneous increase in the electrical conductivity and the thermopower resulted in an increased power factor exhibiting the highest value of 527 μW/mK~2. On the other hand, Pb-doping increased the thermopower but on the expense of electrical conductivity. Although, Pb-doping decreased the electrical conductivity but on the other hand, the enhanced thermopower and the suppressed thermal conductivity were sufficient for achieving ZT value higher than that of pure (Ca_2CoO_3)_(0.62) (CoO_2). Among all the pure and doped samples, the highest ZT value of ～0.33 at 1000 K was achieved by Ba-doping which is about 100% higher than that of the pure (Ca_2CoO_3)_(0.62)(CoO_2).
机译：我们提出了温度不匹配的多晶错配层陶瓷的热电性能。 （Ca_（2-x）M_xCoO_3）_（0.62）（CoO_2），（M：Ba和Pb，x = 0，0.1，0.2），通过溶胶-凝胶法制造，然后进行火花等离子体烧结技术。 X射线衍射结果证实了Ca处（Ca_2CoO_3）_（0.62）（CoO_2）晶格中Ba和Pb的取代。 Ba掺杂在小范围内观察到改善的晶粒取向，这有助于增加电导率，但是对于Pb掺杂的样品，电导率受到灾难性晶粒取向的抑制。二价金属掺杂引起自旋熵增强，从而导致热功率增强。对于掺Ba的样品，电导率和热功率的同时增加导致功率因数增加，最高显示值为527μW/ mK〜2。另一方面，Pb掺杂增加了热功率，但以导电性为代价。虽然，Pb掺杂降低了电导率，但是另一方面，增强的热功率和抑制的热导率足以实现高于纯（Ca_2CoO_3）_（0.62）（CoO_2）的ZT值。在所有纯样品和掺杂样品中，通过Ba掺杂获得的最高ZT值在1000 K时约为〜0.33，比纯（Ca_2CoO_3）_（0.62）（CoO_2）高出约100％。

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  • 来源
    《Energy Conversion & Management》 |2014年第7期|35-41|共7页
  • 作者

    Sajid Butt; Yaoyu Ren; Muhammad Umer Farooq; Bin Zhan; Rizwan Ur Rahman Sagar; Yuanhua Lin; Ce-Wen Nan;

  • 作者单位

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China,Department of Materials Science and Engineering, Institute of Space Technology, Islamabad 44000, Pakistan;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China;

    Beijing National Center for Electron Microscopy, Beijing 100084, People's Republic of China;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermoelectric; (Ca_2CoO_3)_(0.62)(CoO_2); Layered ceramic; SPS;

    机译：热电;（Ca_2CoO_3）_（0.62）（CoO_2）;层状陶瓷;SPS;

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