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Effect of Ta content on the phase transition and piezoelectric properties of lead-free (K0.48Na0.48Li0.04)(Nb0.995-xMn0.005Tax)O3 thin film

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9 Author(s)
Won Ahn, Chang ; Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 680-749, Republic of Korea ; Jin Seog, Hae ; Ullah, Aman ; Young Lee, Sun
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Lead-free (K0.48Na0.48Li0.04)(Nb0.995-xMn0.005Tax)O3 (abbreviated KNL-NMT-x, x = 0 ∼ 0.20) thin films were prepared using a chemical solution deposition method, and the effects of Ta content on the structural, dielectric, ferroelectric, and piezoelectric properties were investigated. X ray diffraction results indicate that the phase structure of KNL-NMT-x films undergoes a transition from orthorhombic to pseudocubic phase with increasing Ta content. The substitution of Ta5+ for the Nb5+ site in the KNL-NMT-x films produced to the relaxor-like ferroelectric with a diffuse phase transition. The KNL-NMT-0.10 thin film at the orthorhombic-pseudocubic phase boundary showed optimum dielectric and piezoelectric properties; dielectric constant ɛr = 2650, Curie temperature Tc = 323 °C, remnant polarization Pr = 16.1 μC/cm2, coercive field Ec = 22.2 kV/cm, and effective piezoelectric coefficient d33,f = 61 pm/V.

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Journal of Applied Physics  (Volume:111 ,  Issue: 2 )