J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (12): 1103-1106.

• Research Articles • 上一篇    下一篇

La0.9A0.1FeO3 (A= Mg, Ca, Sr, Ba)陶瓷的制备，电导率与塞贝克系数

尹娜1,王洪超2,王春雷2   

  1. 1. 山东大学
    2. 山东大学物理学院
  • 收稿日期:2009-08-31 修回日期:2010-02-07 出版日期:2010-12-31 发布日期:2010-12-21
  • 通讯作者: 尹娜
  • 基金资助:

    国家重点基础研究发展计划（973）项目;国家自然基金项目

Synthesis, Electrical Conductivity and Seebeck Coefficient of La 0.9 A 0.1FeO3 (A=Mg, Ca, Sr, Ba)

Na Yin, Hongchao Wang, Chunlei Wang   

  1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2009-08-31 Revised:2010-02-07 Online:2010-12-31 Published:2010-12-21
  • Contact: Na YIN
  • Supported by:

    the National Basic Research Program of China under Grant No. 2007CB607504 and the National Natural Science Foundation of China under Grant No. 50572052.

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摘要： Lanthanum ferrites ceramics La0.9A0.1FeO3 (A= Mg, Ca, Sr, Ba) have been prepared by solid state reaction. X-ray power diffraction analysis reveals that all samples are of pure perovskite structure with orthorhombic phase. Electrical conductivity and Seebeck coefficient have been measured in vacuum within the temperature range between room temperature and 800°C. The electrical conductivity shows semiconducting behavior. Temperature dependence of electrical conductivity indicates that adiabatic small-polaron hopping mechanism is dominant for their electric transportations. Seebeck coefficients are positive for samples, suggesting p-type conduction in the whole temperature range. The highest Seebeck coefficient is found to be 654μV/K for La0.9Mg0.1FeO3. Except La0.9Ba0.1FeO3, the electrical conductivity of La0.9A0.1FeO3 increases with increase of the atomic number of the A-site element, while Seebeck coefficient decreases.

关键词: La0.9A0.1FeO3 ceramics, electrical conductivity, Seebeck coefficient

Abstract: Lanthanum ferrites ceramics La0.9A0.1FeO3 (A=Mg, Ca, Sr, Ba) have been prepared by solid state reaction. X-ray power diffraction analysis reveals that all samples are of pure perovskite structure with orthorhombic phase. Electrical conductivity and Seebeck coefficient have been measured in vacuum within the temperature range between room temperature and 800°C. The electrical conductivity shows semiconducting behavior. Temperature dependence of electrical conductivity indicates that adiabatic small-polaron hopping mechanism is dominant for their electric transportations. Seebeck coefficients are positive for samples, suggesting p-type conduction in the whole temperature range. The highest Seebeck coefficient is found to be 654 μV/K for La0.9Mg0.1 FeO3. Except La0.9Ba0.1FeO3, the electrical conductivity of La0.9A 0.1FeO3 increases with increasing atomic number of the A-site element, while Seebeck coefficient decreases.

Key words: La0:9A0:1FeO3 , ceramics, Electrical conductivity, Seebeck coefficient