...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical chemistry chemical physics: PCCP >Enhancement in thermoelectric performance of SiGe nanoalloys dispersed with SiC nanoparticles
【24h】

Enhancement in thermoelectric performance of SiGe nanoalloys dispersed with SiC nanoparticles

机译：SiGe Nanooloys分散用SiC纳米粒子的热电性能提高

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

SiGe is one of the most widely used thermoelectric materials for radioisotope thermoelectric generator applications for harnessing waste-heat at high temperatures. In the present study, we report a simple experimental strategy for enhancing the thermoelectric and mechanical properties of n-type SiGe nanoalloys by dispersing SiC nanoparticles in a SiGe nanoalloy matrix. This strategy yielded a high value of figure-of-merit (ZT) of similar to 1.7 at 900 degrees C in the SiGe/SiC nanocomposite, which is nearly twice that reported for its pristine bulk counterpart and similar to 15% higher than that of pristine SiGe nanoalloys. This significant enhancement in the ZT primarily originates from a reduction in the lattice thermal conductivity, owing to a high density of nano-scale interfaces, lattice-scale modulations and mass fluctuations, which lead to extensive scattering of heat-carrying phonons. The dispersion of SiC nanoparticles also significantly enhances the mechanical properties of the resulting SiGe/SiC nanocomposite, including fracture toughness and hardness. The enhancement in the thermoelectric and mechanical properties of the SiGe/SiC nanocomposites has been correlated with their microstructural features, elucidated employing X-ray diffraction, and scanning and transmission electron microscopy.
机译：SiGe是用于放射性同位素热电发电机应用的最广泛使用的热电材料之一，用于在高温下利用余热。在本研究中，我们通过分散在SiGe nanooloy基质中的SiC纳米颗粒分散SiC纳米颗粒来提高N型SiGe纳米合金的热电和机械性能的简单实验策略。该策略在SiGe / SiC纳米复合材料中产生了类似于1.7的优选值（Zt）的高值，这几乎是其原始散装对应物的两倍，并且类似于比其更高的15％原始SiGe Nanoalloys。在此ZT提高显著从晶格热导率的降低，由于纳米尺度接口，晶格尺度调制和质量波动，这导致载热声子的散射广泛的高密度主要起源。 SiC纳米颗粒的分散也显着提高了所得SiGe / SiC纳米复合材料的机械性能，包括断裂韧性和硬度。 SiGe / SiC纳米复合材料的热电和机械性能的增强与其微观结构特征相关，采用X射线衍射和扫描和透射电子显微镜。

著录项

  • 来源
  • 作者

    Bathula Sivaiah; Jayasimhadri M.; Gahtori Bhasker; Kumar Anil; Srivastava A. K.; Dhar Ajay;

  • 作者单位

    Natl Phys Lab CSIR Network Inst Solar Energy Dr KS Krishnan Marg New Delhi 110012 India;

    Delhi Technol Univ Dept Appl Phys Delhi India;

    Natl Phys Lab CSIR Network Inst Solar Energy Dr KS Krishnan Marg New Delhi 110012 India;

    Natl Phys Lab CSIR Network Inst Solar Energy Dr KS Krishnan Marg New Delhi 110012 India;

    Natl Phys Lab CSIR Network Inst Solar Energy Dr KS Krishnan Marg New Delhi 110012 India;

    Natl Phys Lab CSIR Network Inst Solar Energy Dr KS Krishnan Marg New Delhi 110012 India;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理学;化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号