0.48 and 0.50 and then decreases at Zr = 0.52 and 0.54, whereas
tandtends to decrease with increasing Zr content, clearly indicat-ing the maximum dielectric constant at MPB composition of
Zr/Ti = 50/50. In addition, a clear transition inTmax(defined as
the temperature at whicher is maximum at 1 kHz) is observed. It
is noticed that an increase in Zr mole fraction leads to a decrease
in Tmax, most likely due to crystal structure of the materials was
changed from tetragonal to rhombohedral, as shown in XRD
patterns inFig. 1. This result suggests that the transition tempera-ture of 0.8PZT–0.2PCN system can be varied over a range from 301
to 321C by controlling the Zr/Ti ratio in the system. Similar
behavior is also reported in previous works[13–18].