Synthesis of BiFeO₃--Bi_0.5Na_0.5TiO₃ Thin Films by Chemical Solution Deposition and Their Properties

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概要

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• Multiferroic BiFeO₃--Bi_0.5Na_0.5TiO₃ thin films were synthesized on Pt/TiO_x/SiO₂/Si substrates by chemical solution deposition. When the amount of Bi_0.5Na_0.5TiO₃ exceeded 30 mol %, perovskite BiFeO₃--Bi_0.5Na_0.5TiO₃ single phase thin films were successfully fabricated in the temperature range of 550--700 °C. Also, the surface morphology of the 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ thin films was improved by optimizing the amounts of excess Bi and Na in 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ precursor solutions. However, measurements of ferroelectric polarization-electric field hysteresis loops were difficult for 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ thin films due to the large leakage current densities at room temperature. At low temperatures, the 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ thin films demonstrated improved insulating resistance and exhibited potential ferroelectric properties. Furthermore, by Mn doping of the 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ films, improved ferroelectric properties with weak ferromagnetism were achieved at room temperature. In 0.7Bi(Fe_0.95Mn_0.05)O₃--0.3Bi_0.5Na_0.5TiO₃ thin films, ohmic conduction was dominant in an electric field range of 0--200 kV/cm and the abrupt increase in leakage current was suppressed even at high electric fields, whereas nondoped 0.7BiFeO₃--0.3Bi_0.5Na_0.5TiO₃ films exhibited nonohmic conduction with a larger leakage current. The remanent polarization and coercive field of the 0.7Bi(Fe_0.95Mn_0.05)O₃--0.3Bi_0.5Na_0.5TiO₃ films at room temperature were approximately 26 μC/cm2 and 250 kV/cm, respectively.

• 2011-09-25

著者

• MORIYA Makoto

  Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University

• Yogo Toshinobu

  Division Of Nanomaterials Science Ecotopia Science Institute Nagoya University

• Sakamoto Wataru

  Division Of Applied Biosciences Graduate School Of Agriculture Kyoto University

• Yogo Toshinobu

  Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan

• Hieno Atsushi

  Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan

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