Domain Wall Engineering in Potassium Niobate Single Crystals and Their Piezoelectric Properties
For potassium niobate (KNbO3) single crystal, the 31 resonators with the highest piezoelectric constant d31 were designed using transformation of axis. We confirmed that the engineered domain configurations with maximum d31 of –55.1 pC/N was caused by a combination between two polarization with polar directions along c and [-101]c directions. Moreover, if there are larger piezoelectric constants from domain wall region, we can expect the much higher piezoelectric properties. To induce the above domain configuration, a new poling method using patterning electrode was investigated. In this study, the two methods on the basis of temperature-induced phase transition at 207 °C and electric-field-induced phase transition at room temperature were investigated.
Keiichi Katayama, Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
K. Yokoh, S. M. Nam, H. Kakemoto, T. Tsurumi, H. Kumagai, S. Wada, "Domain Wall Engineering in Potassium Niobate Single Crystals and Their Piezoelectric Properties ", Key Engineering Materials, Vol. 320, pp. 147-150, 2006