Abstract
ABSTRACT(1–x–y)BiYbO3-xLiNbO3-yBaTiO3 (short form (1–x–y)BY-xLN-yBT) (x=0.1, 0.2, 0.3; y=0.8, 0.7, 0.6, 0.5, corresponding to BY-1LN-8BT, BY-2LN-7BT, BY-1LN-7BT, BY-2LN-6BT, and BY-3LN-5BT) lead-free ferroelectric ceramics were synthesized by sol-gel method. All of BY-LN-BT ceramics were firstly calcined at 800°C for 4 h and then sintered at 1200°C for 2 h. The microstructure, dielectric and ferroelectric properties of the samples were investigated. X-ray diffraction revealed that all the calcined BY-LN-BT powders are of pure single-phase rhombohedral structure. The main phase of all ceramic samples is perovskite structure, and Yb2Ti2O7 pyrochlore phase as the second phase coexists in BY-LN-BT ceramics except for BY-1LN-8BT. The relative densities of BY-LN-BT ceramics decrease with increasing LN content. All ceramic samples consist of well-faceted polyhedral grains, which show non-uniform shape, size and relative compactness. Addition of BT can increase the dielectric constant and promote frequency stability of dielectric properties. The highest relative permittivity is 4480 for BY-1LN- 8BT. The remnant polarization (Pr) and the coercive field (Ec) of BY-LN-BT ceramics decrease with decreasing frequency. The maximum values of Pr (1.706 μC.cm–2) and Ec (956.2V.mm–1) are obtained for BY-3LN-5BT, but its leakage current is very high. The best comprehensive electrical properties are obtained for BY-1LN-8BT ceramics.
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