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Progress in Chemistry 2010, Vol. 22 Issue (01): 44-50 Previous Articles   Next Articles

• Invited Article •

Novel La2Mo2O9Oxide-Ion Conductor

Ruan Bei1,2; Yan Baijun1; Zhang Jiayun1**   

  1. (1.School of Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China; 2. Department of Chemistry, Hebei Normal University, Shijiazhuang 050016, China )
  • Received: Revised: Online: Published:
  • Contact: Zhang Jiayun E-mail:zhjiayun@metall.ustb.edu.cn
  • Supported by:

    National Natural Science Foundation of China

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La2Mo2O9 is a novel type of oxide-ion conductor with high oxide-ion conductivity. Its conductivity is about 0.06 S/cm at 1073K, which is comparable to that of yttria-stabilized zirconia at 1273K. Consequently, it has potential applications in intermediate-temperature solid oxide fuel cells, oxygen sensors, oxygen permeable membrane, solid-state ionic devices, etc. In this paper, the recent research progresses regarding the structure, properties, doping, diffusion mechanism of oxide-ion in La2Mo2O9 crystal are reviewed. Valuable information is provided, which will be beneficial for the future research on these oxide-ion solid electrolytes.

Contents
1 Introduction
2 Crystal structure of La2Mo2O9
2.1 Structure of α-La2Mo2O9 
2.2 Structure of β-La2Mo2O9 
3 Phase transformation and properties of La2Mo2O9 
3.1 Phase transformation
3.2 Electrical properties
3.3 Thermal expansion
3.4 Chemical stability
4 Diffusion mechanism of oxide-ion in La2Mo2O9 
5 Ion doping in La2Mo2O9
5.1 Influence on phase transition and structure of La2Mo2O9
5.2 Influence on electrical properties of La2Mo2O9
5.3 Influence on availability of sintering of La2Mo2O9 
5.4 Influence on chemical stability of La2Mo2O9 
6 Electrode compatibility of LAMOX with other electrode materials
7 Conclusions

Key words: lanthanum molybdate, solid electrolytes, oxide-ion, SOFCs, doping

CLC Number: 

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Abstract

Novel La2Mo2O9Oxide-Ion Conductor