Abstract
The electrolyte conduction is a factor that influences the power density of Solid oxide fuel cells (SOFCs). Pyrochlore phase is a superstructure of the fluorite, and it has an empty 8b site completely under ordered pyrochlore structure. Therefore, the pyrochlore structure oxides of R2(ZrTi)O7 series were considered that they might have potential to become an excellent SOFC electrolyte material in this report. R2(ZrTi)O7 (R = La, Nd, Sm, Eu, Gd, Dy, Y, Ho, Er and Yb) were made by mixed with Li2O flux and heat treatment by 1000 and 1400 °C. The crystal structures identified by XRD are all pyrochlore structures. The lattice parameters were obtained through Rietveld refinement. Scanning electron microscopy was used to observe microstructure directly and verify the relative density result which was obtained by Archimedes method. The Electrical properties of electrochemical impedance spectroscopy (EIS) were measured to compare with lattice parameters. Dy2(ZrTi)O7 has the highest conductivity of 5.37(1) × 10−4 S·cm−1 at 700 °C and Nd2(ZrTi)O7 has the lowest activation energy of 0.59(2) eV in R2(ZrTi)O7 series. Dy2(ZrTi)O7 was combined with carbonate to become composite material for electrical property observation and comparing with Dy2(ZrTi)O7.
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