EFFECTS OF MORPHOLOGY AND SPACE CHARGE ON ELECTRICAL CONDUCTIVITY OF POROUS BODIES

摘要

A simple, one dimensional model on the role of connectivity on electrical conductivity of porous bodies, including the roles of grain boundaries and space charge, was developed. Porous samaria-doped ceria (SDC) samples were fabricated using two methods: (1) conventional sintering of powder compacts and (2) a method comprising the fabrication of sintered NiO + SDC two phase samples, followed by reduction of NiO to Ni, and the removal of Ni by acid leaching. The conductivities of as-fabricated bar samples were measured using DC 4-probe technique. The experimental data are consistent with the simulation results.