KNbO3films were synthesized at 120-240 °C by a hydrothermal method. The deposition amount of KNbO3films decreased with decreasing deposition temperature because the deposition rate decreased together with the increase in the starting time of precipitation. The KNbO3phase was ascertained at temperature as low as 120 °C in films deposited on (100)cSrRuO3//(100)SrTiO3substrates. On the other hand, powders prepared at 150 °C included the Nb2O5phase as well as the KNbO3phase. In addition, powders prepared at 120 °C consist of the K3Nb7O19phase instead of the KNbO3phase. KNbO3films were deposited at 150 °C on LaNiO3/Pt/Ti/polysulfone substrates. Films consisting of the polycrystalline KNbO3phase were obtained, and their ferroelectricity and piezoelectricity were observed. The remanent polarization and piezoelectric coefficient were 4.2μC/cm2and 20-32pm/V, respectively.
ASJC Scopus subject areas
- Physics and Astronomy(all)