Abstract:
The Na+ is volatile in (Na0.5Bi0.5)0.94Ba0.06TiO3 -based ceramics. In order to find the effects of Na+ amount on structure and electrical properties of (Na0.5Bi0.5)0.94Ba0.06TiO3 -based ceramics, (Na0.5Bi0.5)0.94Ba0.06TiO3+xwt.%Na2CO3 (BN6BT-xNa, x=0, 0.5, 1, 2) lead-free ceramics were prepared via conventional solid state reaction method. Effect of excess Na2CO3 on sintering behavior, crystallite structure, microstructure, piezoelectric, dielectric and ferroelectric properties were studied. The ceramics sintered at 1 180℃ exhibit pure ABO3 perovskite structure. The size of grains in the ceramics varies with the the amount of Na+ .The structure and electrical properties of (Na0.5Bi0.5)0.94Ba0.06TiO3 -based ceramics are tightly related to the Na+ amount. The ceramic with x=1 sintered at 1 180 ℃ exhibits the highest bulk density(5.73 g/cm3), highest piezoelectric charge constant (88 pC/N), higher remanent polarization (25.5 μC/cm2) and lower coercive field (27.5 kV/cm).
