Synthesis and Characterization of Fine Grained High Density La2Mo2O9-based Oxide-ion Conductors

材料科学技术（英）, 2008, 24(5): 761-765.

^1, , ^2, , ^3, , ^4, , ^5,

1.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China;Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040, China

2.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China;Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040, China

3.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China

4.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China

5.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China;Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040, China

Synthesis and Characterization of Fine Grained High Density La2Mo2O9-based Oxide-ion Conductors

Jianxin WANG ^1, , Qin WANG ^2, , Xianping WANG ^3, , Chun LI ^4, , Qianfeng FANG ^5,

3.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China

4.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031,China

Keywords： Oxide ion conductor

A cost-effective technique, including nanocrystalline powder preparation using a modified Pechini method and a two-step low-temperature sintering route, was developed for the synthesis of high performance La2Mo2O9-based oxide-ion conductors. The optimum parameters of the compaction pressure, the first step and the second step sintering temperatures for the synthesis of fine grained, high density and uniform La2Mo2O9-based oxide-ion conductors were determined by a series of sintering experiments. High density and uniform sintered La2Mo2O9 samples with average grain size from 0.8 to 5 μm and La1.96K0.04MO2O8.96 sample with average grain size as small as 500 nm were synthesized by using this cost-effective method. The impedance measurement results show that the as-fabricated La2Mo2O9-based ceramics possess much higher ionic con-ductivity than that obtained by solid state reaction method. It is found that in the range of 0.8-5 μm the grain size of dense La2Mo2O9 samples prepared from the nanocrystalline powders has little influence on their conductivities.

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Synthesis and Characterization of Fine Grained High Density La2Mo2O9-based Oxide-ion Conductors

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