Effects of Li(2)CO(3)and CuO as Composite Sintering Aids on the Structure, Piezoelectric Properties, and Temperature Stability of BiFeO3-BaTiO(3)Ceramics

摘要

In order to reduce the sintering temperature of ceramics, the effects of binary composite sintering aids, Li(2)CO(3)and CuO, on the sintering temperature and properties of 0.7BiFeO(3)-0.3BaTiO(3)-0.0035MnCO(3) + 0.002Li(2)CO(3) + xCuO (BF-BT-LC + xCuO) ceramics were studied by traditional solid-state sintering. The results show that the sintering liquid phase can effectively promote the sintering of BF-BT-LC + xCuO ceramics by adding a certain amount of Li(2)CO(3)and changing the amount of CuO. The samples sintered at 930 degrees C/2 h with 0.4 mol.% CuO get a piezoelectric constantd(33) = 168 pC/N, an electromechanical coupling coefficientk(p) = 0.302, and a mechanical quality factorQ(m) = 31.207. The addition of CuO was conducive to obtaining stable BF-BT-LC + xCuO piezoelectric ceramics. We conclude that the composite sintering aids, Li(2)CO(3)and CuO, can effectively promote the sintering of BF-BT-LC + xCuO, which is beneficial to obtain BF-BT-LC + xCuO ceramics with a wide sintering temperature range and stable properties.