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Lead-free Piezoelectric BiFeO3-BaTiO3 Thin Film With High Curie Temperature

M. Lee, D. Kim, J. Park, M. Kim, T. Song, S. Kumar, W. Kim, D. Do, I. Hwang, B. Park, K. S. Choi
Published 2016 · Chemistry

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Abstract Polycrystalline 0.67Bi1.05FeO3-0.33BaTiO3 (BF33BT) lead-free piezoelectric thin film is fabricated on Pt(111)/Ti/SiO2/Si(100) substrate by using pulsed laser deposition technique. The remnant polarization (2Pr) and coercive field (2EC) observed from polarization hysteresis (P-E) loop are 18 μC/cm2 and 208 kV/cm, respectively. The local piezoelectric constant (d33,PFM) of BF33BT thin film is 92.5 pm/V which is as high as lead-based piezoelectric thin film results. From the temperature dependent dielectric constant result, the Curie temperature is 405 °C. These results show that BF33BT thin film is a promising candidate for lead-free piezoelectric nano- and micro-devices with high Curie temperature.
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