Effects of Zr/Ti ratio on the microstructure of the 0.8Pb(ZrxTi1x)O3–0.2Pb(Co1/3Nb2/3)O3 ceramics are displayed in
Fig. 2. The grain size of the ceramics varies considerably from 1.00 to 11.31lm, as listed inTable 1. However, the average grain size only slightly increases with increasing Zr content. Since the grain size of PZT-based materials strongly depends on the compo-sition ratio, nucleation energy, and growth energy, the composi-