Abstract: We used high temperature solid state reaction method for synthesizing Y³⁺-doped BaCeO₃ solid electrolyte BaCe_1-xY_xO_3-δ (x=0.10~0.30). X-ray diffraction analysis shows that the samples crystallized in a perovskite phase. The non-linear relationship between proton conductivity and Y3+ content of sample is closely related with the oxygen vacancy, the defect association and the solid solubility of Y.

Key words: XRD, solid solubility, oxygen vacancy, defect association