Abstract
In this work, an electric field-induced giant strain response and electric displacement, as well as temperature-dependence dielectric, impedance and energy storage densities were studied in lead-free BNT-based ferroelectric system. The XRD analysis reveals that all the investigated ceramics have a pure perovskite structure. A maximum energy storage density up to 0.907 J/cm3 at 80 kV/cm is exhibited for (1−x) Na1/2Bi1/2TiO3–xBa(Mg1/3Nb2/3)O3 ceramics at an x of 0.07. Follow-up experiments confirm that an electric-field-induced phase transition, which results in giant strain up to 0.12% at 10 Hz, is also the origin of initially weak piezoelectricity. After doping a certain amount of Ba(Mg1/3Nb2/3)O3, it is obvious that the dielectric peaks shift to low temperature and present dispersion characteristic. The increase in composition (x) can suppress grain conductivity heavily in high temperatures, thus gives a way how to adjust the nominal BNT composition for the reduction of leakage conductivity.
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