Abstract
C-axis-oriented Sr0.5Ba0.5Nb2O6 (SBN) thin films were prepared on a La0.05Sr0.95TiO3 substrate by pulsed laser deposition. The c-axis orientation and grain size of the SBN thin films depend on the substrate temperature (Tsub) and oxygen gas pressure (PO2 ) during the deposition. When Tsub and PO2 were fixed at 750 °C and 11 mTorr, respectively, a prepared SBN thin film exhibited a distinct c-axis orientation and a smooth surface. The SBN thin film consisted of well-developed grains with a diameter of 150 nm. Its remanent polarization (Pr) and coercive field (Ec) were 2Pr=23.9 µC/cm2 and 2Ec=160 kV/cm, respectively. The band gap of the distinctly c-axis-oriented SBN thin film was about 3.1 eV, which is in agreement with that of the SBN single crystal.
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