Abstract
Lattice distortion embedded core-shell SrTiO3-BaTiO3 nanoparticles were synthesized by epitaxially growing BaTiO3 shell on the SrTiO3 core. Lattice strain heterostructure interface was identified in the core-shell particles. The lattice strain interface can be maintained in the SrTiO3-BaTiO3 bulk ceramic which came from the gradient of Ba concentration near grain boundary and significantly influenced their dielectric response at high frequency (0-1 GHz). Compared to Ba0.6Sr0.4TiO3 ceramic, broader Curie peaks, enhanced polarization, and weakened dielectric nonlinearity were obtained for the SrTiO3-BaTiO3 ceramics. The SrTiO3-BaTiO3 ceramic possesses stable frequency dispersion property and maintained the ferroelectrics feature due to the lattice strain interface over Currie temperature. This work gives a novel aspect to characterize lattice strain interface and evaluate the lattice strain effect on the dielectric response of ferroelectrics. Furthermore, the low cost and facile synthesis process of the core-shell particles is suitable for large-scale production with unique properties and wide applications.