Abstract
Lead-free ferroelectric K0.5Na0.5NbO3 (KNN) thick films were successfully prepared by polyvinylpyrrolidone (PVP)-modified chemical solution deposition method. The effect of PVP amount on structures and electrical properties of KNN thick films has been investigated. Thickness of the films is in a range of 0.70 and 4.35 μm depending on the addition amount of PVP in the precursor solutions. All the films show pure perovskite phase. The X-ray photoelectron spectroscopy analysis indicates that PVP has a negligible effect on KNN films when the addition amount is smaller than 0.25. While the increasing amount of PVP can promote the formation of the perovskite phase. The surface morphologies are dense except KNN films with the ratio of PVP monomer to KNN of 1.25. The KNN films with the ratio of PVP monomer to KNN of 1.0 exhibit large dielectric constant of 662 at 1 kHz and the saturated polarization-electric field hysteresis loops. Even though KNN thick films with the ratio of PVP monomer to KNN of 1.25 show the porous morphology, the largest piezoelectric constant d 33 of 62 pm/V is obtained.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
