The piezoelectric properties of 0.65Pb(Zr1-xTix)O3-0.35Pb(Zn1/6Ni1/6Nb2/3)O3 (PZTx-PZNN) ceramics with 0.530≤ x≤0.555 were investigated for application to piezoelectric energy harvesters. Although a morphotropic phase boundary (MPB) was found at approximately x＝0.545, the ceramic with the highest figure of merit (FOM) (d33×g33) was observed at a composition of x＝0.540. Values of this figure of merit, d33×g33, of 19.6 pm2/N and 20.2 pm2/N were obtained from PZT0.540-PZNN ceramics sintered at 920℃ and 950℃, respectively. A high output power of 937 μW and a high power density of 3.3 mW/cm3 were obtained from unimorph-type piezoelectric energy harvesters fabricated using PZT0.540-PZNN ceramic sintered at 920℃ for 4h.
