Electrical conductivity of low-doped ceria-based ceramics

Abstract

Ceria-based ceramic materials (M_0.01Ce_0.99O₂) were synthesized by a co-precipitation method and sintered at 1000 °C for 4 h in air. The electrical conductivity of these systems was measured by AC impedance spectroscopy at 500–750 °C in air. Introduction of small amounts of dopants such as copper, bismuth, samarium, and neodymium increased this parameter by 4–5 times. However, the optimal dopants were Bi or Nd due to their higher conductivity and oxide ion transference number.