4.6 Article

Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La3-xCaxTe4

期刊

JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 40, 页码 10459-10466

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01648g

关键词

-

资金

  1. NASA Science Missions Directorate's Radioisotope Power Systems Technology Advancement Program
  2. NSF IGERT: Materials Creation Training Program (MCTP) [DGE-0654431]
  3. California NanoSystems Institute
  4. EFRC Solid-State Solar-Thermal Energy Conversion Center (S3TEC) [DE-SC0001299]
  5. Summer Undergraduate Research Fellowship (SURF) through CalTech
  6. Summer Undergraduate Research Fellowship (SURF) through JPL
  7. UCLA MSD Scholars Program

向作者/读者索取更多资源

The thermoelectric properties from 300-1275 K of calcium-doped La3-xTe4 are reported. La3-xTe4 is a high temperature n-type thermoelectric material with a previously reported zT(max) similar to 1.1 at 1273 K and x = 0.23. Computational modeling suggests the La atoms define the density of states of the conduction band for La3-xTe4. Doping with Ca2+ on the La3+ site is explored as a means of modifying the density of states to improve the power factor and to achieve a finer control over the carrier concentration. High purity, oxide-free samples are produced by ball milling of the elements and consolidation by spark plasma sintering. Calcium substitution upon the lanthanum site was confirmed by a combination of Rietveld refinements of powder X-ray diffraction data and wave dispersive spectroscopy. A zT(max) similar to 1.2 is reached at 1273 K for the composition La2.2Ca0.78Te4 and the relative increase compared to La3-xTe4 is attributed to the finer carrier concentration.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据