Formation of the Microcrystalline Structure in LiNbO3 Thin Films by Pulsed Light Annealing

LiNbO3 thin films with a thickness of 200 nm were deposited onto Al2O3 substrate by RF-magnetron sputtering technique without intentional substrate heating. The results demonstrate that post-growth infrared pulsed light annealing of the amorphous LiNbO3 films leads to the formation of two phases, LiNbO3 and LiNb3O8. After annealing at temperatures of 700 to 800 °C, the percentage of the nonferroelectric phase LiNb3O8 was minimal. The surface composition of the films annealed at different temperatures was examined by X-ray photoelectron spectroscopy. Piezoresponse force microscopy was used to study both the vertical and the lateral polarization and to visualize the piezoelectric inactivity of LiNb3O8 grains. A comparison of the results of PFM and XPS measurements revealed that there is a correlation between the fraction of the piezoelectric phase and the film composition: At an annealing temperature higher than 850 °C, the atomic ratio of lithium to niobium decreases compared to the initial value along with a decrease of the fraction of the piezoelectric phase

PROCESSING AND CHARACTERIZATION OF LEAD-FREE KNN- BASED PEROVSKITE CERAMICS MODIFIED BY ZNO

Influence of ZnO additive on structure, microstructure, dielectric, ferroelectric and local piezoelectric properties of (K0.5Na0.5)NbO3 – based ceramics have been studied. Increase in dielectric parameters and effective d33 piezoelectric coefficients was observed

Structure, ferroelectric and local piezoelectric properties of KNN-based perovskite ceramics

Structure, microstructure, dielectric, ferroelectric, and local piezoelectric properties of perovskite ceramics in the systems (1-x)(K0.5Na0.5)NbO3–x(Bi0.5Na0.5)TiO3 (x = 0 ÷ 0.1) and (1-x)(K0.5Na0.5)NbO3–x(Bi0.5Na0.5)ZrO3 (x = 0.01 ÷ 0.05) have been studied. Improvement of dielectric parameters and effective d33 piezoelectric coefficient was obtained in compositions with x = 0.03 and 0.05, correspondingly. © 2020, © 2020 Taylor & Francis Group, LLC

Ferroelectric and local piezoelectric properties of modified KNN ceramics

Influence of cation substitution on structure parameters, microstructure, dielectric, ferroelectric and local piezoelectric properties of (K0.5Na0.5)NbO3 ceramics additionally modified by Li+ and Mn3+ cations (up to 10 at. %) have been studied. Changes in dielectric properties and effective d33 piezoelectric coefficients were observed depending on compositions of solid solutions. © 2019, © 2019 Taylor & Francis Group, LLC