Abstract
Dielectric and piezoelectric properties of perovskite materials such as La modified Pb(Zr,Ti)O3 ceramics and Pb(Zn1/3Nb2/3)O3-PbTiO3 single crystals were investigated for cryogenic capacitor and actuator applications. Enhanced extrinsic contributions resulted in piezoelectric coefficient (d33) as high as 250 pC/N at 30 K, superior to that of PZT (d33 ∼ 100 pC/N). This cryogenic property enhancement was associated with retuning the MPB for cryogenic temperatures. PZN-PT single crystals exhibited dramatic property improvements such as d33 > 500 pC/N at 30 K as a result of an engineered domain state.
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