2018 Volume 65 Issue 10 Pages 673-677
In this study, KNbO3 films were deposited on Ni-based metal coils with different curvature by hydrothermal method. The deposition of KNbO3 films was hardly observed directly on metal coils. However, the growth of well-adhered KNbO3 films was promoted by using LaNiO3-surface layers on Ni-based metal coil. Film thickness increased with increasing deposition time above 1 h and reached to 12.5 μm at 2.5 h. X-ray diffraction measurements revealed that the crystal structure did not depend on the average curvature radius. The dielectric constant and the remanent polarization were respectively 105 and 11 μC/cm2, which were almost the same with flat films. This means that these are almost independent of the radius of curvature. These results indicate that the hydrothermal method is an effective way as a deposition technique for the piezoelectricc films onto metal substrates having a three-dimensional structure.
