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

材料科学技术（英文）, 2009, 25(4): 535-538.

^1, , ^2, , ^3, , ^4, , ^5, , ^6, , ^7,

1.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

2.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

3.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

4.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

5.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

6.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

7.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

基金项目: 国家重点基础研究发展规划(973计划)(2007CB607505) 国家高技术研究发展计划(863计划)(2009AAO3Z216)

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

Jinle Lan ^1, , Yuanhua Lin ^2, , Ao Mei ^3, , Cewen Nan ^4, , Yong Liu ^5, , Boping Zhang ^6, , Jingfeng Li ^7,

1.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

2.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

3.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

4.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

5.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

6.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

7.State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords： CaMnO3

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.

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