Preparation and Characterization of Highly C-Axis-Oriented Ba₂NaNb₅O₁₅ Thin Film on La_0.05Sr_0.95TiO₃ Substrate

Ba2NaNb5O15 (BNN) thin films were grown on La-doped SrTiO3 substrates by the pulsed laser deposition method. The c-axis orientation of BNN thin films depends on the oxygen gas pressure (P-O2). When the P-O2 and deposition temperature were fixed at 7.5 mTorr and 700degreesC, respectively, the BNN thin film exhibited a highly c-axis orientation. The c-axis-oriented BNN thin film consisted of well-developed grains and exhibited a smooth surface. The remanent polarization (P-tau) and coercive field (E-c) were 2P(Gamma) = 95.3 muC/cm(2) and E-c = 400 kV/cm, respectively.