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本文用固相反应烧结制备出Li2Mo2O6多晶材料。经X射线分析、红外光谱和电子顺磁共振谱(EPR)的研究,确定了它的结构是Li2Mo2O4和MoO2两个晶相组成的烧结体。钼离子以四价状态存在于MoO2晶相结构中。采用交流阻抗谱分析了晶界与温度变化的相关性。测得了样品的ln(σ总T)-1/T 曲线是由两段直线和一段曲线所组成;总电导率化能σ27℃=1.36×10-3(Ω·cm)-1,σ115℃=1.49×10-3(Ω·cm)-1,σ300℃=9.71×10-3(Ω·cm)-1,σ370℃=2.42×10-3(Ω·cm)-1;电导活化能E1=0.043eV,E2=0.235eV,E平均=0.76eV。采用维格纳极化电池法测得电子电导率σe,σe27℃=2.240×10-5(Ω·cm)-1,σe300℃=4.476×10-3(Ω·cm)-1。实验证明,室温下材料为固体电解质,300℃附近为良好的离子与电子混合导体。The polycrystal material Li2Mo2O6 is prepared using solid phase firing method. By X-ray diffraction, IR and ESR spectra, we determined that the polycrystal material is composed of two phases: Li2Mo2O4 and MoO2. Molybdenum exists in MoO2 crystal phase in the form of Mo4+. The relationship between crystal interface and temperature is analyzed by AC complex impedance spectroscopy. The AC conductivity is measured and it is found that the ln(σT)-l/T curve consists of two straight and one curved segments. The conductivity is σ27℃=1.36×10-3(Ω·cm)-1,σ115℃=1.49×10-3(Ω·cm)-1,σ300℃=9.71×10-3(Ω·cm)-1,σ370℃=2.42×10-3(Ω·cm)-1. The activation energy is E1 = 0.043eV, E2 = 0.235eV, Eav = 0.76eV. The electronic conductivity σe is measured by Wagner method, σe27℃ = 2.24×10-5 (Ω·m)-1, σe300℃= 4.476×10-3(Ω·m)-1. It is proved that the material is a solid electrolyte at room temperature and a mixed conductor at 300℃.
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