Peculiar temperature aging effects on the piezoelectric constant of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystal near the morphotropic phase boundary

Guisheng Xu; Xiaofeng Wang; Danfeng Yang; Ziqing Duan; Chude Feng; Kai Chen
January 2005
Applied Physics Letters;1/17/2005, Vol. 86 Issue 3, p032902
Academic Journal
After temperature aging, peculiar changes of the piezoelectric response of 0.67 Pb(Mg1/3Nb2/3)O3-0.33 PbTiO3 crystals appeared. The piezoelectric constant d33 of the (001)-cut crystals with TRT∼35 °C abruptly rose more than 1000 pC/N in some regions after heat treatment at 65 °C for 12 h. For the (001)-cut crystals with TRT∼74 °C, in spite of a fall of 40–100 pC/N after heat treatment at 65 °C for 12 h, the values of d33 rose 50–100 pC/N unexpectedly after the subsequent heat treatment at 85 °C for 4 h. The structure adjustment caused by the internal stress relaxation during heat treatment at T>TRT accounted for the enhancement of d33.


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