Structural and ionic conductivity studies of doped ceria electrolyte

Abstract

The present study reports synthesis, XRD, Impedance spectroscopy and ionic conductivity of Ce 1-x(Gd 0.5Pr 0.5) xO 2 (x = 0-0.24) system. These samples were synthesized through the sol-gel process followed by low temperature combustion. The samples were sintered at 1300C to obtain dense ceramics (over 98%). XRD confirms the single phase with a cubic structure. The two-probe a.c. impedance spectroscopy was used to study the ionic conductivity of doped ceria samples. The Ce 0.88(Gd 0.5Pr 0.5) 0.12O 2, Ce 0.84(Gd 0.5Pr 0.5) 0.16O 2 compositions showed highest grain ionic conductivity values i.e., 1.012 × 10 -2 Scm and 1.059 × 10 -2 Scm respectively at 500°C. © 2011 The Electrochemical Society.