Abstract
? 2022 Elsevier B.V.Ba0.5Sr0.5TiO3-MgO composite ceramics have been prepared through spark plasma sintering (SPS) process. Phase composition, microstructures and dielectric properties have been systematically characterized. In this composite system, with the gradual increase of the MgO content, the dielectric constant of the composite ceramics drops drastically. On the contrary, when the MgO content varies between 0% and 30%, the tunability of composite ceramics have not decreased significantly, but increased instead. High tunability of 16.53% and relatively low dielectric constant of 415 are realized simultaneous at 3 kV/mm, 10 kHz when the dielectric content is 30%. Its tunability is even higher than pure Ba0.5Sr0.5TiO3 under the same electric field condition, which indicates that SPS is an effective means to suppress the ion diffusion between ferroelectric-dielectric composite ceramics and improve the tunability.
NSTL
Elsevier