Abstract
The piezoelectric-enhanced (Na0.535K0.475)(Nb0.55Ta0.45)O3 (NKNT) ceramics with Na/K excess and Ta substitution were prepared near the polymorphic phase composition with an orthorhombictetragonal structure. The dielectric, piezoelectric, and ferroelectric properties of the lead-free NKNT ceramics are discussed. The temperature dependences of the specific dielectric and ferroelectric properties were investigated in detail. Broadened dielectric anomalies and saturated ferroelectric P-E hysteresis loops were observed over the phase transitional temperature range of the orthorhombic-tetragonal phase (TO−T). Additionally, the particular behaviors of the dielectric and the ferroelectric polarizations at the polymorphic phase boundary (PPB) are also discussed.
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Acknowledgments
This work was supported by a National Research Foundation of Korea Grant funded by the Korean Government (2015R1D1A1A01061417 and 2017R1D1A3B03034839).
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Kim, J.S., Lee, H.S. Dielectric Response and Ferroelectric Polarization of Piezoelectric Enhanced (Na0.535K0.475)(Nb0.55Ta0.45)O3 Ceramics at the Orthorhombic-Tetragonal Polymorphic Phase Transition. J. Korean Phys. Soc. 76, 843–847 (2020). https://doi.org/10.3938/jkps.76.843
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DOI: https://doi.org/10.3938/jkps.76.843