PREPARATION AND FERROELECTRIC PROPERTIES OF LEAD-FREE A0.5Bi0.5TiO₃ (A = Na OR K) THIN FILMS

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Both ferroelectric Na 0.5 Bi 0.5 TiO 3 (NBT) and K 0.5 Bi 0.5 TiO 3 (KBT) are considered as the best known lead-free materials. In this experiment, we prepared NBT and KBT thin films on Pt/TiO 2 /SiO 2 /Si substrates by metalorganic solution deposition. The structural properties and surface morphologies were measured using X-ray diffraction and atomic force microscopy. The NBT and KBT films show higher leakage currents due to the oxygen vacancies in the films. The remanent polarization and coercive field of NBT (KBT) thin film are 9 (5.2) μC/cm 2 and 50 (25) kV/cm at an applied electric field of 150 kV/cm. The relative dielectric constants of NBT and KBT are 340 and 316 at 1 MHz, respectively.