Dielectric and ferroelectric properties of (Bi₀.₅Na₀.₅)TiO₃ – (Bi₀.₅K₀.₅)TiO₃ – BaTiO₃ thin films deposited via chemical solution deposition Public Deposited

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  • Dielectric and ferroelectric properties of (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3–BaTiO3 thin films deposited via chemical solution deposition
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  • Polycrystalline ferroelectric lead-free 85 mol% (Bi₀.₅Na₀.₅)TiO₃–10 mol% (Bi₀.₅K₀.₅)TiO₃–5 mol% BaTiO₃ (85BNT–10BKT–5BT) thin films were fabricated via chemical solution deposition on platinized silicon substrates. The permittivity and dielectric loss at 1 kHz were 610 and ∼3.5%, respectively. The ferroelectric properties at room temperature and as a function of the temperature up to 125 °C were also investigated. The polarization hysteresis loop at room temperature showed a P[subscript MAX] of 31 μC/cm² and P[subscript r] of 6 μC/cm² at 200 Hz. The shapes of the hysteresis loops at room temperature and 125 °C were nearly identical, indicating good temperature stability. A dense surface morphology was observed and cross sectional microscopy revealed equiaxed grain growth. Based on these measurements, 85BNT–10BKT–5BT thin films may be a good candidate for lead-free piezoelectric-based microelectromechanical systems (MEMS).
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  • Jeon, Y.H., Patterson, E.A., Cann, D.P., & Gibbons, B.J. (2013). Dielectric and ferroelectric properties of (Bi₀.₅Na₀.₅)TiO₃ – (Bi₀.₅K₀.₅)TiO₃ – BaTiO₃ thin films deposited via chemical solution deposition. Materials Letters, 106, 63-66. doi:10.1016/j.matlet.2013.04.096
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