Abstract
Microstructural and piezoelectric properties of 0.72Pb(Zr1−xTix)–0.28Pb(Zn0.4Ni0.6)1/3Nb2/3O3 (PZ1−xTx‐PZNN) ceramics with 0.50 ≤ x ≤ 0.55 were investigated for evaluating the possibility of their use in multilayer actuators and energy harvesters, which demand a large piezoelectric strain constant (d33) and a small dielectric constant (εT33/εo). The PZ0.47T0.53‐PZNN ceramic with a morphotropic phase boundary (MPB) composition showed large d33 and εT33/εo values, making it unsuitable for use in multilayer actuators and energy harvesters. However, the PZ0.48T0.52‐PZNN ceramic with a rhombohedral structure showed a small εT33/εo value of 1605, yet maintained a large d33 of 550 pC/N. Thermal stimulation did not have any significant effect on the piezoelectric properties of this specimen, except for a slight increase in the εT33/εo value upon heating the specimen at 150°C for 4 h. In an effort to reduce the sintering temperature, CuO was used as an additive for the ceramic. As a result, the CuO‐added PZ0.48T0.52‐PZNN ceramic was well sintered at 900°C. In particular, the 1.0 mol% CuO‐added PZ0.48T0.52‐PZNN ceramic exhibited a large d33 value of 554 pC/N and a small εT33/εo value of 1620, making it highly suitable for use in multilayer actuators and energy harvesters.
Published Version
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