Electrostrictive effect and dielectric properties of lead-free 0·5Ba(Zr_xTi_1–x)O₃–0·5(Ba_0·75Ca_0·25)TiO₃ ceramics near morphotropic phase boundary (MPB) compositions

Abstract

The ceramics of 0?5Ba(ZrxTi1-x)O3-0?5(Ba0?75Ca0?25)TiO3(x50?15, 0?20, 0?25 and 0?30) (BZT-BCT) were synthesized by the conventional solid-state reaction method. And then, the dielectric, ferroelectric and electrostrictive properties of the ceramics were investigated near morphotropic phase boundary (MPB). Meanwhile, its crystallographic structure had been found to change from tetragonal phase to pseudocubic phase by the raising Zr 4+ content from 0?15 to 0?30. And the grains morphology was observed from SEM. Finally, when the ceramics sintered at 14008C for 2h with x50?15, The excellent properties were obtained: The electrostrictive strain reaches 0?16% under 40 kV cm 21 , and T m =1028C, which demonstrated that the BZT-BCT has superior strain capacity as a lead-free system.

Ferroelectric, piezoelectric properties and thermal expansion of new Bi(Ni3/4W1/4)O3–PbTiO3 solid solutions

“…This is because ignoring the inuence of the ionic radius difference, raising BNW content would lead to the increase of the sum of ionic polarizability, as a result, the dielectric constant would be enhanced. 32 Fig. 10(a) and (b) show the polarization-electrical eld (P-E) hysteresis loops and switching currents of xBNW-(1 À x)PT ceramics with all compositions under bipolar electric elds of 60-90 kV cm À1 at room temperature.…”