Preparation and Properties of Highly Oriented Sr0.3Ba0.7Nb2O6 Thin Films by a Sol-Gel Process |
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Authors: | Nishio Keishi Seki Nobuhiro Thongrueng Jirawat Watanabe Yuichi Tsuchiya Toshio |
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Affiliation: | (1) Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba, 278-8510, Japan |
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Abstract: | We succeeded in the preparation of epitaxial or highly oriented strontium-barium niobate (Sr0.3Ba0.7Nb2O6) thin film by a sol-gel process. A homogeneous coating solution was prepared with Sr and Ba acetates and Nb(OEt)5 as raw materials, and acetic acid and diethylene glycol monomethyl ether as solvents. Sr0.3Ba0.7Nb2O6 film sintered at 900°C on MgO(1 0 0) was oriented with c-axis perpendicular to the substrate surface. Sr0.3Ba0.7Nb2O6 film sintered at 700°C on SrTiO3(1 0 0) was an epitaxial and oriented with c-axis in parallel to the substrate surface. Transmittance of Sr0.3Ba0.7Nb2O6 film (film thickness: 144 nm) was more than 60% at the range from 400 to 800 nm. Refractive index was 2.33 at 633 nm. Dielectric constant and dielectric loss of the Sr0.3Ba0.7Nb2O6 thin films prepared on polycrystal Pt substrates were 600 and 0.06 at room temperature and 1 kHz, respectively. The curie temperature (Tc) of polycrystalline Sr0.3Ba0.7Nb2O6 thin films was about 200°C. At room temperature and 50 kHz, remanent polarization (Pr) and coercive field (Ec) of the polycrystalline thin films were 1.79 C/cm2 and 2.69 kV/cm, respectively. |
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Keywords: | epitaxial thin film ferroelectric |
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