Preparation and Properties of CaZr1―xInxO3―α Proton Conductor

CaZr1―xInxO3―α(x=0, 0.05, 0.10, 0.15) ceramics were synthesized by using solid state reaction method at 1400 and then sintered at 1550 or 10 h in air. The XRD results show that there exist CaZrO3 and infinitesimal CaIn2O4 phases. The AC impedance spectra of the sintered CaZr1―xInxO3―α were measured in the temperature range from 600 o 850 n argon atmosphere containing water vapor. The relation between conductivity and temperature was obtained, as well as the activation energy. At 800 the conductivity of CaZr1―xInxO3―α is 4.64×10―7 S/cm (x=0), 3.06×10―4 S/cm (x=0.05), 3.89×10―4 S/cm (x=0.1), 3.93×10―4 S/cm (x=0.15), respectively. The results show that the conductivities of the samples improves remarkably, the activation energy decreases rapidly with In doping contents increasing. The conductivities slightly increase with the increase of In doping contents (x>0.1), they increases greatly with the increase of temperature. The relationship between In doping contents and conductivity are deduced.