BaTiO3-Bi(Mg3/4W1/4)O3 lead-free relaxor ferroelectric ceramics with improved energy storage properties

In this study, (1-x)BaTiO3-xBi(Mg3/4W1/4)O-3 [(1-x)BT-xBMW] lead-free ceramics have been prepared via solid-state reaction method. X-ray patterns indicated that the as-obtained ceramics show perovskite structure without the formation of a second phase and tetragonal phase of BT transformed into a pseudo-cubic phase via introduction of BMW. The grain size and density of the samples were observed by SEM, average grain size of the ceramics gradually decreased from 3.75 mu m at x = 0.05 to 2.54 l mu m at x = 0.15, but it increased to 2.83 mu m at x = 20. It was observed from P-E hysteresis loops that modification with appropriate amount of BMW was an effective approach to modulate relaxation behavior of BT, subsequently its energy-storage performance was promoted. Improved energy-storage performance of W-rec = 1.71 J cm(-3) and g = 91.97% can be achieved in the 0.85BT-0.15BMW ceramics, accompanied with outstanding temperature (20-120 degrees C) and frequency (1-100 Hz) stabilities. (1 - x)BT-xBMW ceramic is expected to be a potential candidate for energystorage equipments with high stability.