采用掺杂Sc2O3, 通过固相反应法制备了CaZr1-xScxO3-α(x=0, 0.1, 0.15)材料. 在610---850℃采用交流阻抗谱法测定了CaZr1-xScxO3-α的电导率及电导激活能, 并对CaZrO3掺Sc及掺In样品的电学性能进行了比较. 结果表明: 在610---850℃,CaZrO3的电导率为4.3×10$-19---1.4×10-6 S/cm,CaZr1-xScxO3-α(x=0.1, 0.15)的电导率为1.16×10-4---1.4×10-3S/cm,CaZr1-xInxO3-α(x=0.1, 0.15)的电导率为0.34×10-4---4.33×10-4 S/cm, 且随着温度的升高而提高; 掺杂能极大提高CaZrO3的电导率, 并随着掺杂量的增加, 电导激活能降低, 电导率增加; 温度及掺杂量相同时, 掺Sc材料电导率明显高于掺In材料, 说明掺Sc对提高材料的电导率更有效.
CaZrO3 solid state electrolyte displays proton conductivity and high chemical stability. The Sc doped CaZrO3 proton conductors were prepared by solid state reaction in order to improve the conductivity in this study. XRD analysis suggest that CaZr1-xScxO3-α(x=0, 0.1, 0.15) samples were synthesized completely. The electrochemical impedance spectra were applied to study the conductivities and the activation energy for proton diffusion of the CaZr1-xScxO3-α(x=0, 0.1, 0.15) in the temperature range of 610---850℃, and the electric conductivities of CaZr1-xScxO3-α were compared with those of CaZr1-xInxO3-α. The experiment results show that the electric conductivities of CaZrO3, CaZr0.9Sc0.1O3-α, CaZr0.85Sc0.15O3-α, CaZr0.9In0.1O3-α and CaZr0.85In0.15O3-α are 4.3×10-19---1.4×10-6 S/cm (610---850℃), 1.16×10-4---4.6×10-4 S/cm (690---850℃), 1.8×10-4---1.4×10-3 S/cm (610---850℃), 0.34×10-4---4.30×10-4 S/cm (741---847℃) and 0.57×10-4---4.33×10-4 S/cm (585---814℃), respectively. These conductivities results show that the conductivity of CaZrO3 proton conductor can be significantly improved by doping. The conductivities of CaZrO3 increase with the Sc doping content and temperature increasing. The results reveal that the conductivities of CaZr1-xScxO3-α are higher than those of CaZr1-xInxO3-α. Sc--doping is more beneficial for increasing the conductivity of CaZrO3 solid state electrolyte.
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