Preparation and electrical properties of SBN thin films derived from aqueous organic gels

摘要

Sr_(0.5)Ba_(0.5)Nb_2O_6 (SBN50) thin films have been prepared using aqueous organic gel method. The differences in the decomposition between Sr-Ba-Nb nitrate precursor solutions with different pH values were investigate. By heat treatment at 700 deg C for 2 h, SBN thin films with smooth and crack-tree surface were derived from the precursor solution of a lower pH = X. XRD patterns revealed the polycrystalline nature of the SBN thin films on Pt/Ti/SiO_2/Si(100) substrates. Electric properties measurement indicated that the SBN films demonstrated a ferroelectric hysteresis loop. The remanent polarization (P_r) and coercive field (E_c) were 8.17 (mu)C/cm~2 and 16.9 kV/cm, respectively.