Three types of green compacts were formed by using applied loads of 1, 2, and 3 ton, respectively, and were sintered at 980 • C. The sintered ceramics with an applied load of 1 ton had the highest volume shrinkage, but the density was almost similar for all ceramics. There was no change in the crystal structure for all ceramics. The piezoelectric and the ferroelectric properties of the ceramics showed that the ceramic with an applied load of 1 ton had the best direct piezoelectric coefficient (d33) and the largest remnant polarization. The microstructure indicated that the ceramics with an applied load of 1 ton had an average grain size of 6 μm. The results suggest that the piezoelectric property could be directly related to the grain size.