Anisotropic Ferroelectric Properties of MOD-derived Bi_(3.25)Nd_(0.75)Ti_3O_(12) Thin Films

The c-axis and a-axis preferential-oriented Bi3.25Nd0.75Ti3O12 (BNT) thin films together with (117)-orientation were deposited on (111)Pt/Ti/SiO2/Si substrates by a metalorganic decomposition (MOD) method. The results show that the crystallinity of BNT thin films mainly depends on the pre-annealing conditions. BNT thin films with a-axis preferential orientation show high remnant polarization, high coercive field, high dielectric constant, high dissipation factor, and large capacitance tuning, while those with c-axis preferential orientation are on the contrary. The anisotropic ferroelectric properties of BNT thin films are similar to those of Bi4Ti3O12 (BIT).