Preparation and characterization of Ce < inf > 1-x < /inf > Dy < inf > x-y < /inf > Sr < inf > y < /inf > O < inf > 2-δ < /inf > system

Abstract

The effect of dysprosium and strontium on the total ionic conductivity of ceria in the system Ce1-xDyx-ySryO 2-δ was studied. In this system, few compositions were prepared with x=0.15, y=0.015, 0.03 and 0.045 by modified sol-gel process using maltose and pectin as organic precursors. Rietveld refinement of XRD patterns confirms the cubic structure with space group Fm3̄m. SEM images show relatively uniform grains with clean and distinct grain boundaries. Four probe AC impedance measurements were carried out to evaluate the total ionic conductivity in the temperature range of 150-500 °C and frequency range of 40 Hz-1 MHz. The composition Ce0.85Dy0.12Sr0.03O 2-δ shows higher electrical conductivity than single-doped ceria samples. © 2014 The Nonferrous Metals Society of China.