International Center For Actuators And Transducers
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH INST
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1 There are three loss origins in piezoelectrics dielectric, elastic and piezoelectric losses. 180 deg and non-180 deg domain wall motions contribute primarily to the dielectric and elastic losses, respectively. 2 Heat generation occurs in the sample uniformly under an off-resonance mainly due to the intensive dielectric loss, while heat is generated primarily at the vibration nodal points via the intensive elastic loss under a resonance. 3 Doping rare-earth ions into PZT-PbMn,XO3 X Sb, Nb ceramics increases the maximum vibration velocity up to 0.9 ms, which corresponds to one order of magnitude higher energy density than conventionally commercialized piezo-ceramics. 4 To obtain stabilized high vibration velocity, domain wall stabilization via the positive internal bias field rather than local domain wall pinning seems to be essential.
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