Zr_(0.92)Mg_(0.08)O_(1.92)和Zr_(0.92)Y_(0.08)O_(1.96)固体电解质的制备及性能

Fabrication and Properties of Zr_(0.92)Mg_(0.08)O_(1.92) and Zr_(0.92)Y_(0.08)O_(1.96) Solid Electrolyte

采用固相合成法在1 650℃分别合成了Zr0.92 Mg0.08O1.92和Zr0.92 Y0.08O1.962种固体电解质,其相对密度分别为96.19％和95.12％.XRD分析表明在Zr0.92 Mg0.08O1.92和Zr0.92Y0.08O1.96固体电解质中均含有立方固溶体相,SEM分析表明2种材料微观结构致密.采用交流阻抗法分别测定了Zr0.92 Mg0.08O1.92及Zr0.92Y0.08O1.96固体电解质在1 000～1 600℃的电导率.结果表明：随着温度的升高,Zr0.92 Mg0.08O1.92固体电解质的电导率不断增大,但Zr0.92Y0.08O1.96的电导率在1 400℃时达到最大值（7.24×10-2 S/cm）,随后降低;在1 000～1 450℃,Zr0.92 Y0.08 O1.96的电导率高于Zr0.92 Mg0.08 O1.92,在1 500～1 600℃,Zr0.92 Mg0.08 O1.92的电导率高于Zr0.92Y0.08 O1.96.分析得到Zr0.92 Mg0.08 O1.92和Zr0.92Y0.08 O1.96在1 000～1 450℃温度区间的电导激活能分别为1.61和0.20 eV,在1 450～1 600℃温度区间的电导激活能分别为0.55和0.85 eV.

Zr0.92 Mg0.08 O1.92 and Zr0.92 Y0.08 O1.96 solid electrolyte were synthesized by a solid state reaction method at 1 650 ℃,respectively.The relative densities of Zr0.92 Mg0.08 O1.92 and Zr0.92 Y0.08 O1.96 are 9 6.19 ％ and 9 5.12 ％.According to the analysis by Xray diffraction,the two solid electrolytes both contain a cubic solid solution phase.The scanning electron microscope photograph demonstrates that the microstructure morphology of Zr0.92 Mg0.08 O1.92 and Zr0.92 Y0.08 O1.96 are compact.The ionic conductivity of Zr0.92 Mg0.08 O1.92 and Zr0.92 Y0.08 O1.96 solid electrolyte were measured by AC impedance spectroscopy at 1 000-1 600 ℃.The ionic conductivity of Zr0.92 Mg0.08 O1.92 increases with increase of temperature.The conductivity of Zr0.92 Y0.08 O1.96 firstly increases and then decreases with the increase of temperature,and reaches the optimum value of 7.24 × 10-2 S/cm at 1 400 ℃.The conductivity of Zr0.92 Y0.08 O1.96 is greater than that of Zr0.92 Mg0.08 O1.92 at 1 000 1 450 ℃（℃.The conductive activation energies of Zr0.92 Mg0.08 O1.92 and Zr0.92 Y0.08 O1.96 obtained are 1.61 and 0.20 eV at 1 000 1 450 ℃,respectively,and they are 0.55 and 0.85 eV at 1 450-1 600 ℃,respectively.