Microstructure and Property Study of La2M01.5Wo.5O9/Ag Composites

摘要

Based on the oxygen ion conductor La_2M_(0.5)W_(0.5)O_9, a series of Ag_2O doped samples La2M01.5W_(0.5)O_9/Ag were prepared with conventional solid-state reaction method. The effects of Ag_2O doping on the microstructure and electrical conductivity have been investigated by XRD, FESEM and direct current conductivity measurements. With the increase of Ag_2O doping, the grain was further refined and compacted, meanwhile, Ag diffusion distribution in the form of second-phase appear at grain boundary. The sample density and conductivity also gradually increased with the increasing of doping amount. The conductivity of the composite specimen La_2Mo_(0.5)W_(0.5)O_9 /Ag has a great enhancement when the concentration of Ag_2O is around 27 wt%, which is eight times higher than that of the single-phase sample.