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 BaTiO3 nanopowders (C-BTO) prepared by the co-precipitation 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 BaTiO3 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 (ɛmax) of 3545 and low dielectric loss (tanδ) of 0.011. Besides, by tailoring the particle size of C-BTO@PR powders, dense BaTiO3 ceramics with mean size of 135–308 nm can be obtained with sizes similar to initial particle. The results demonstrate that PR coated BaTiO3 nanopowders in core–shell structure is an effective strategy to prepare BaTiO3 nanoceramics controllably.