Property of modified BaTiO3 ceramics by ultrafast high temperature sintering
The densification,grain growth and property of the piezoelectric ceramics are greatly affected by the sintering method. (Ba0.92Ca0.08) (Ti0.97Zr0.03)O3 ceramic was prepared by ultrafast high temperature sintering in this work. The effect of the conventional sintering and ultrafast high temperature sintering on the phase composition,microstructure,dielectric,ferroelectric and piezoelectric properties were compared. The relative density of the sample is enhanced with the increase of the sintering current in the ultrafast high temperature sintering. The dielectric constant and loss at Curie temperature are 12212.5 (1 kHz) and 0.0059 under the optimized condition (230 A for 5 min). The remanent polarization is 9.92μC/cm2 while the piezoelectric constant d33 reaches 392 pC/N at room temperature. Compared with that of the conventional sintering,the dielectric,ferroelectric and piezoelectric properties of the ceramic obtained by ultrafast high temperature sintering are close due to similar composition and microstructure. However,the holding time is sharply decreased to 2.1％ of the conventional sintering. The ultrafast high temperature sintering is novel fast sintering process for high-performance piezoelectric ceramics.
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