Preparation and characterization of monodisperse Ag nanoparticles doped barium titanate ceramics

摘要

The phase, microstructure and dielectric properties of monodisperse Ag nanoparticles doped BaTiO_3 ceramics with different contents of silver (0.0-20.0 mol percent ) were investigated in this paper. The XRD analysis showed that no phases other than BaTiO_3 and silver were observed in the ceramics;;it implied that silver did not react with BaTiO_3 during sintering process. A small amount of monodisperse Ag nanoparticles (<0.5 mol percent ) was added to BaTiO_3 ceramics could improve the sintered density;;more content of monodisperse Ag nanoparticles (0.5-2.0 mol percent ) would decrease the relative density;;larger content of monodisperse Ag nanoparticles (>2 mol percent ) could still improve the relative density. As the content of monodisperse Ag nanoparticles increased, the permittivity of ceramics increased continuously, while the dielectric loss decreased first and then increased. The ceramic doped with 1.0 mol percent monodisperse Ag nanoparticles had the better dielectric properties.