Preparation and Characterization of Yb Doped SrCeO₃ Based High Temperature Proton Conductor

Small amount of H₃BO₃, SrCl₂ or SrF₂ improved the specific gravity of calcined SrCeO₃ based powder. The addition of 2% SrF₂ made 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 SrF₂ does not degrade the material properties. The proton transference number is close to unit in the temperature range of 773-973K.