Abstract In this study, the bulk and surface acoustic waves (BAW SAW) propagation properties of (K,Na)NbO 3 (KNN) films deposited by hydrothermal synthesis or RF magnetron sputtering methods were evaluated to investigate applicability such high-frequency devices. For KNN(001)-oriented method, a BAW phase velocity 6,900 m/s an electromechanical coupling coefficient k t 2 8.4% obtained. From meas...

In this paper, lead free (K0.48,Na0.52)NbO3 (KNN(48-52)) piezoelectric ceramics were made by conventional solid state sintering process. Additives of nano ZnO (n-ZnO), nano CuO (n-CuO) and nano SnO2 (n-SnO2) were used in order to decrease the sintering temperature, as well as modifying the dielectric, piezoelectric and ferroelectric propert...

Lead-free piezoelectric one-dimensional (1D) nanostructures have exhibited great potential in building biocompatible micro/nano-energy harvesters and self-powered smart sensors. However, their low coefficient still remains as the biggest obstacle for practical applications. In this work, an ultrahigh with calibrated d 33 from 400 pm V -1 to 814 is achieved Li-doped (K,Na)NbO 3 (KNLN) lead-free ...

Resonant ultrasound spectroscopy (RUS) provides a window on the pervasive influence of strain coupling at phase transitions in perovskites through determination of elastic and anelastic relaxations across wide temperature intervals and with the application of external fields. In particular, large variations of elastic constants occur at structural, ferroelectric and electronic transitions and, ...