Synthesis and Characterization of BiFeO3–PbTiO3 Thin Films through Metalorganic Precursor Solution

概要

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Perovskite ($1-x$)BiFeO3–$x$PbTiO3 thin films have been synthesized by the chemical solution deposition of metalorganic compounds. Homogeneous and stable BiFeO3–PbTiO3 precursor solutions were prepared by selecting appropriate starting materials and 2-methoxyethanol as a solvent. Perovskite BiFeO3–PbTiO3 powder samples with a composition ranging from $x=0.1$ to 0.5 showed weak ferromagnetism at room temperature. Perovskite BiFeO3–PbTiO3 single-phase thin films on Pt/TiOx/SiO2/Si substrates with good surface morphology were also fabricated by optimizing the PbTiO3 content. Ferroelectric polarization–electric field ($P$–$E$) hysteresis loops were observed for 0.7BiFeO3–0.3PbTiO3 thin films, although some leakage current components are included at room temperature. The electrical resistivity of the BiFeO3–PbTiO3 films was improved in the low temperature region, and the remnant polarization and coercive field of the 700 °C-prepared 0.7BiFeO3–0.3PbTiO3 thin films at $-190$ °C were approximately 50 μC/cm2 and 150 kV/cm, respectively. Furthermore, Mn doping into BiFeO3–PbTiO3 was effective in improving the ferroelectric properties of the resultant thin films at room temperature.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-09-30