SrCeO_3基高温质子导体的制备与性能测定

Preparation and Characterization of Yb Doped SrCeO_3 Based High Temperature Proton Conductor

添加H_3BO_3,SrCl_2或SrF_2等助熔剂显著提高了焙烧得到的SrCe_(0.95)Yb_(0.05)O_(3-α)陶瓷粉料的比重。添加2％SrF_2使比重接近理论值。用此陶瓷粉料在较低温度较短时间条件下烧结即可得到密度符合固体电解质要求的烧结体。DTA、TG、XRD分析结果表明,助熔剂促使SrCeO_3在较低温度下开始生成并使反应完全。交流阻抗谱、氢浓差电池电动势测定结果表明,助熔剂对电导率、离子活化能无明显影响。973K以下温度的质子迁移数接近1。

Small amount of H3BO3, SrCl2 or SrF2 improved the specific gravity of calcined SrCeO3based powder. The addition of 2% SrF2made the specific gravity close to the theoretical. The results of DTA, TG and XRD shown that the addition of fluxes accelerates the formation of SrCeO3. Using the precursor powder, ceramics having density above 94% of the theoratical have been sintered. The measurements of AC impedance and EMF of hydrogen concentration cell shown that the addition of SrF2does not degrade the material properties. The proton transference number is close to unit in the temperature range of 773-973K.