Effects of processing temperature on the structure and ferroelectric properties of Ba2−xSrxNaNb5O15 thin films by pulsed laser deposition (original) (raw)
2008, Journal of Alloys and Compounds
Ba 2−x Sr x NaNb 5 O 15 thin films have been prepared on La 0.05 Sr 0.95 TiO 3 substrates by pulsed laser deposition. Structural and ferroelectric properties of the thin films were dependent on the substrate temperature (T sub) and Sr concentration. When the oxygen gas pressure (P O 2) and T sub were fixed at 7.5 mTorr and 700 • C, respectively, the Ba 2−x Sr x NaNb 5 O 15 (x = 0, 0.6, 1.0 and 1.4) thin films exhibited a highly c-axis orientation. The thin films consisted of well-developed grains and exhibited a smooth surface. The c-axis oriented Ba 0.6 Sr 1.4 NaNb 5 O 15 thin film prepared at T sub = 650 • C also exhibited highly c-axis orientation and good P-E hysteresis loop. The remanent polarization (P r) and coercive field (E c) were 2P r = 24.9 C/cm 2 and 2E c = 107 kV/cm, respectively.
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