学术论文

      High-temperature Electric Properties of Polycrystalline La-doped CaMnO3 Ceramics

      Abstract:
      Polycrystalline La-doped CaMnO3 ceramics have been prepared by a solid-state sintering method. Analysis of microstructure and phase composition indicates that the addition of La can prohibit the further growth of grain, and no impurity phase appears. The results revealed that the La doping can lead to a large change of the activation energy (from 0.22 to 0.02 eV), and thus result in a marked increase in electric conductivity of 2-4 orders of magnitude. The power factor can reach about 1.5×10-4 W·m-1·K-2 in a wide temperature range, which potentially make them attractive for n-type high-temperature thermoelectric materials.
      Author: Jinle Lan [1] Yuanhua Lin [1] Ao Mei [1] Cewen Nan [1] Yong Liu [2] Boping Zhang [2] Jingfeng Li [1]
      作者单位: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
      年,卷(期): 2009, 25(4)
      分类号: TB3
      机标分类号: O61 TS1
      在线出版日期: 2009年9月10日
      基金项目: 国家重点基础研究发展规划(973计划),国家高技术研究发展计划(863计划)