Both electric field and temperature independent behavior of piezoelectric property of Pb(Ni1/3Nb2/3)O3–PbTiO3

• Temperature dependence of strain under unipolar cycling have been investigated in the (1 − x) Pb(Ni1/3Nb2/3)O3–xPbTiO3 solid solutions.
• The value of large-sigonal d33 is of nearly a constant (∼520 pm/V) and keeps in approximately a plane in the ranges of both temperatures from RT to 100 °C and electric field from 0.0 to 2.0 kV/mm.

The temperature stability of electromechanical properties is an important issue of major concern for the design of actuators. In this paper, temperature dependence of ferroelectric properties have been investigated in the (1 − x)Pb(Ni1/3Nb2/3)O3–xPbTiO3 (x = 0.30–0.38) solid solutions. Interestingly, the unipolar strain in the composition of x = 0.38 shows a good linear relationship with increasing electric field, and the large-signal d33 is independent with increasing temperature from room temperature to 100 °C. Furthermore, it also exhibits a very high piezoelectric coefficient d33 = 450 pC/N near the morphotropic phase boundary. All above indicates the present system of (1 − x)Pb(Ni1/3Nb2/3)O3–xPbTiO3 may be a kind of potential application for precisely controlling actuators.

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