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本文用固相反应烧结制备出Li_2Mo_2O_6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Li_2Mo_2O_6和MoO_1两个晶相组成的烧结体。钼离子以四价状态存在于MoO_2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(1叶agT)-1/T曲线是由两段直线和一段曲线所组成;总电导率化能σ_(27·C)=1.36×10~(-3)(Ω·cm)~(-1),σ_(115·C)=1.49×10~(-3)(Ω·cm)~(-1),σ_(300·C)=9.71×10~(-3)(Ω·cm)~(-1),σ_(370·C)=2.42×10~(-3)(Ω·cm)~(-1);电导活化能E_1=0.043eV,E_2=0.235eV,E_(平均)=0.76eV。采用维格纳极化电池法测得电子电导率4,σ_(e27·C)=2.240×10~(-5)(Ω·cm)~(-1),σ_(e300·C)=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。
In this paper, Li 2 Mo 2 O 6 polycrystalline materials were prepared by solid-state reaction sintering. The structure of Li2Mo2O6 and MoO1 crystal was confirmed by X-ray analysis, IR and EPR (electron paramagnetic resonance spectroscopy). Molybdenum ions exist in the tetravalent state in the MoO 2 crystal phase structure. The relationship between grain boundary and temperature was analyzed by AC impedance spectroscopy. The ln (1-leaf agT) -1 / T curve of the sample was found to consist of two sections of straight line and a section of curve. The total electrical conductivity of the sample was 27.2 C × 1.36 × 10 -3 (Ω · cm) Σ - 115 · C = 1.49 × 10 -3 Ω · cm -1 and σ 300 - C = 9.71 × 10 -3 Ω · Cm -1 and σ 370 370 C were 2.42 × 10 -3 Ω · cm -1. The conductance activation energy E 1 = 0.043eV, E 2 = 0.235eV, E_ ( Average) = 0.76eV. The electronic conductivity was measured by the Wigner polarization cell method. The results were as follows: σ e27 C = 2.240 × 10 -5 Ω · cm -1 σ e300 C = 4.476 × 10 ~ (-3) (Ω · cm) -1. Experiments show that the material at room temperature as a solid electrolyte, near 300 ℃ for the good ion-electron mixed conductor.