Effects of glass additives on microstructure, dielectric and ferroelectric properties of BaTiO3-BiYbO3 based ceramics

(100-x) wt% (0.95BT-0.05BY)-x wt% (0.5MgO-0.5SiO(2)) (x = 0, 1, 2, 4, 8) ceramics were fabricated by using a solid-state synthesis method. The effects of the MgO-SiO2 doping on the microstructure, the ferroelectric, and the dielectric properties of BT-BY ceramics were investigated in detail. The results show that the relative permittivity initially decreases and then increases again upon the increase in the MgO-SiO2 content. The addition of the MgO-SiO2 glass oxide dopant enhances the frequency and the temperature stability of the relative permittivity of BT-BY ceramics. Moreover, the coercive field and the remnant polarization increase and then decrease with increasing MgO-SiO2 dopant content, while the slim P-E loops are observed when x >= 2. The largest values for the remanent polarization (1.2 mu C cm(-2)) and the coercive field (9.18 kV cm(-1)) are obtained at x = 1. The addition of MgO-SiO2 can induce a small leakage current in the BT-BY ceramic when x >= 2. The breakdown strength increases with decreasing grain size when MgO-SiO2 is added moderately. Its value increases from 80 kV cm(-1) up to 100 kV cm(-1) when x changes from 0 to 8. The energy storage density and efficiency of the (100-x) wt% (0.95BT-0.05BY)-xwt% (0.5MgO-0.5SiO(2)) ceramics decrease and then increase with increasing x. The maximum values of the electrical energy storage density (0.24 J cm(-3)) and energy efficiency (85.77%) are obtained when x = 8.