Synthesis of Oriented Ba2NaNb5O15 (BNN) Thin Films from an Alkoxy-derived Precursor |
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| Authors: | Toshinobu Yogo Wataru Sakamoto Tadayuki Isaji Masao Ichida Arao Nakamura Shin-ichi Hirano |
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| Affiliation: | Department of Applied Chemistry, Graduate School of Engineering, Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya 464–8603, Japan;Division of Materials Science, Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya 464–8603, Japan |
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| Abstract: | Ba2NaNb5O15 (BNN) thin films with a tungsten bronze structure were fabricated using a precursor solution that was synthesized from barium, sodium, and niobium alkoxides. Highly (002)-oriented BNN films were prepared successfully on Pt(100)/MgO(100) substrates at 700°C, using a BNN underlayer. X-ray pole-figure measurement showed that the BNN films that crystallized on Pt(100)/MgO(100) substrates had two in-plane orientations. The remanent polarization and coercive field of the BNN film (thickness of 1.0 µm) that was crystallized at 700°C were 12.3 µC/cm2 and 101 kV/cm, respectively, at –150°C (123 K). BNN films on fused silica substrates exhibited second harmonic generation upon irradiation with 1064 nm light. |
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