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Detailed Program
Paper Number : PI-O01
Time Frame : 11:25~11:37
Presentation Date : Thurseday, 27, November
Session Name : Piezoelectric Materials, Devices & Applications
Session Chair 1# : Hongsoo Choi
Session Chair 2# : Isaku Kanno
PZT-PZNN Ceramics for Energy Harvesting and Multilayer Actuator Applications
Dae-hyeon KIM
Korea University
Microstructural and piezoelectric properties of the 0.72Pb(Zr1-xTix)-0.28Pb(Zn0.4Ni0.6)NbO3 (PZ1-xTx-PZNN) ceramics with 0.50‖x‖0.55 have been investigated for the application to the actuators and energy harvesters, which have multilayer structure. These devices require a large piezoelectric strain constant (d33) and a small dielectric constant (ュT33/ュo). The PZ0.47T0.53-PZNN ceramic having a morphotropic phase boundary (MPB) composition shows the large d33 and ュT33/ュo values, which is not a suitable material for such devices. However, the PZ0.48T0.52-PZNN ceramic, which has a pseudo-cubic structure, shows a small ュT33/ュo of 1605 due to a large remnant polarization but still maintains a high d33 of 550 pC/N. In addition, although the ュT33/ュo value slightly increased when the specimen was heated at 150oC for 4 h, the effect of thermal stimulation was not significant. Moreover, the CuO-added PZ0.48T0.52-0.28PZNN ceramic was well sintered at low temperature of 900oC. In particular, the 1.0 mol% CuO-added PZ0.48T0.52-0.28PZNN ceramic exhibited the large d33 value of 554 pC/N and small ュT33/ュo of 1582, indicating that this material is a good candidate for the multilayer actuators and energy harvesters.
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