Effect of Ca2+ Ions on Electrical Properties of Ba1−xCa x Ti0.90Sn0.10O3–0.05Y2O3 Ceramics
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Ba1−xCa x Ti0.90Sn0.10O3–0.05Y2O3 (BCTSY) lead-free piezoceramics with x = 0.02 to 0.10 have been fabricated by solid-state sintering method at 1420°C. The effects of Ca2+ ions on the microstructure and electrical properties of the samples were studied. X-ray diffraction analysis showed that all samples possessed pure perovskite structure with Ca2+ ions diffused into the matrix lattice. The rhombohedral phase and tetragonal phase coexisted in the composition range of 0.02 < x < 0.06. The microstructure of BCTSY ceramic became more homogeneous with addition of Ca2+ ions, and the average grain size of the samples decreased from 97 μm (x = 0.02) to 18 μm (x = 0.10). Addition of Ca2+ remarkably improved the piezoelectric properties, enhanced the dielectric frequency dispersion, and increased the Curie temperature of the ceramics. The piezoelectric properties of the ceramics were optimized at x = 0.04 with d33 and Kp values of 579 pC/N and 52.7%, respectively.
KeywordsBaTiO3 Ca doping piezoelectric properties dielectric properties ferroelectrics
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