Relaxor Ferroelectric BaTiO3-Bi(Mg2/3Nb1/3)O3 Ceramics for Energy Storage Application

Perovskite solid solution ceramics of (1-x)BaTiO3-xBi(Mg2/3Nb1/3)O-3 (BT-BMN) (x=0.05-0.2) were synthesized by solid-state reaction technique. The results show that the BMN addition could lower the sintering temperature of BT-based ceramics. X-ray diffraction results reveal a pure perovskite structure for all studied samples. Dielectric measurements exhibit a relaxor-like characteristic for the BT-BMN ceramics, where broadened phase transition peaks change to a temperature-stable permittivity plateau (from -50 degrees C to 300 degrees C) with increasing the BMN content (x=0.2), and slim polarization-electric field hysteresis loops were observed in samples with x0.1. The dielectric breakdown strength and electrical resistivity of BT-BMN ceramics show their maxima of 287.7kV/cm and 1.53x10(13)cm at x=0.15, and an energy density of about 1.13J/cm(3) is achieved in the sample of x=0.1.