A new strategy to achieve the controllable preparation of nanoceramics with BaTiO3@resin core–shell nanoparticles

Abstract

In this paper, phenolic resin (PR) is coated on the monodispersed BaTiO 3 nanopowders (C-BTO) prepared by the coprecipitation method via a core-shell manner. This PR can optimize nanopowders' dispersibility in the granulation, and act as a grain growth inhibitor during sintering. So BaTiO 3 nanoceramics with dense and size-controlled morphology were achieved at a low sintering temperature. The microstructural and dielectric studies show that the grain size and dielectric properties initially increase and then decrease as the amount of PR increases. Moreover, the activation of PR is optimal at 20 wt%, and obtained ceramics have a high density and uniform grain size, with a relatively high dielectric constant (ɛ max) of 3545 and low dielectric loss (tanδ) of 0.011. Besides, by tailoring the particle size of C-BTO@PR powders, dense BaTiO 3 ceramics with mean size of 135-308 nm can be obtained with sizes similar to initial particle. The results demonstrate that PR coated BaTiO 3 nanopowders in core-shell structure is an effective strategy to prepare BaTiO 3 nanoceramics controllably.